Ergotron – LX HD Sit-Stand Single Monitor Arm, VESA Desk Mount – for Monitors Up to 49 Inches, 14 to 30 lbs – Polished Aluminum

I just got this in last night and overall this is a great mount.Installation:Installation couldn't have been easier. The instructions were well laid out and had I actually followed them I would have saved myself some headaches. My first mistake was not installing the VESA extenders before attaching it to the monitor. This left me with 2 stripped screws, but I find that is completely my fault as I tried to force them. Once i replaced the 2 screws with new ones and did it correctly, the arm attached to the monitor easily.A Note on installation, while I didn't end up using this (see below), I found that a 1/2" hole is more than big enough to attach the mount to the desk using the grommet mount (if you don't want to use the edge clamp).Use:This thing is great with one caveat. It allows me to go from sitting to standing without issue and the 20" lift is good, but not what I would call great depending on your height. I am 5'10" and it is attached to my 30" tall desk. At it's max height, my 43" monitor is just barely at the correct height for me. If I were taller I might be concerned that it would not go high enough.I am giving it 5 stars because for my use it is a near perfect fit, but depending on your height, you might need to take into consideration it's limits on height. It's not that it doesn't go up high, but if you are 6'3", it might not go high enough for comfort when in a standing position. now, if you aren't using it for a sit/stand, I still think it is great and offers a wide range a movement.Cable management:The mount has 2 different ways of managing cables used on the 2 arms. The arm directly on the pole has a "tray that comes out and you run the cables under. At first I preferred this, but I have 4 HDMI cables, a power cable and soon to have a few USB cables. At is is, the 4 HDMI cables and the power cable are pushing that channel to it's limits. I'm not sure I'll get anymore cables in there. I realize the fact that I have so many HDMI cables may not be the norm so didn't knock any stars off. I also have some thinner HDMI cables on the way to help with that.The second method is used on the arm that attaches to the monitor. It just uses cable ties and some tabs to run the cable ties over on the underside of the arm. This means it is not as "clean" looking at the method above, but it has the added benefit of allowing more cables. I plan on sleeving all my cables in 1 sleeve to help clean this up, but it's not high priority and is probably being picky.Over all, I think the cable management is going to be great for the vast majority of people out there.Cost:This thing costs a lot! I had huge sticker shock when I went to first go and purchase it. However I have a 27lb 43" monitor (LG 43MU79-b or 43UD79-b - both are the same monitor) and this mount was the one that offered the range of movement I needed for my purpose. After receiving it and feeling the build quality I think the cost is justified, but somewhere deep inside a small piece of me still wonders how much of the cost is inflated because of the "standing desk" craze.A Note on placement:When I first set to install mine, I decided to drill some new holes in my desk. I have a corner desk and I assumed the best placement would be to put the arm in the back corner. So I drilled a 2" hole for a cable grommet and about 2" or so from it's edge drilled a 1/2" hole for the grommet adapter for the mount. This worked great for attaching the monitor to the desk and giving me a close by grommet hole to feed the cables. However, because my desk sits in a corner, I lost a lot of movement. One part of the arm would hit the wall and that would be as far back as it would go.What I found helped, was I changed out the grommet mount to the edge clamp style mount and tried a few places along the edge until I found a good spot. Unfortunately My desk's sides prevent me from using that mount permanently so once I knew where a good position was, I used that to determine where to put the grommet mount. Now, it ends up that using one of my desks existing grommet holes was the best placement so I refrained from drilling any new holes. I routed the cables to the new 2" grommet I drilled and placed an order for a 1/2" cap to cover my mistake.For those that have corner desks, what I found was that placing the arm about 13" from the back corner on either side gives me the best range of motion as the portion of the arm attached to the pole will rotate almost exactly into the corner.For those with normal desks, I would suggest you consider placing the mount off center, but if possible use the edge clamp option to position it first if you plan on using the grommet mount for permanent mounting. That way if you need to drill holes you can do so knowing it's in the right place.If I were to do this again knowing the above, I would have placed the new grommet hole I drilled much closer to the one I used for mounting for a much cleaner install. As it is, it's not bad (See picture), but I would have preferred the cables go through the desk much closer to the mount. I did contact ergotron before buying it and suggested that they look into a way to pass the cables through the mount through the same grommet hole you mount it to (some do this, but were not heavy duty enough). They said they would pass it down to their product development team, so maybe that change will come in a newer version.

With the new 40" 3840 x 2160 (UHD, 4K) monitors out there, at 40", as a computer programmer, I was just praying that a super quality monitor arm would be available.As others may know who use the 40" 4K's for work, as of the date I write this, those 40" 4K's (such as the Philips) are fantastic - but have terrible mounts, just fixed in position. The mount alone makes the 40" screen almost unusable after a few weeks, because you need at least a LITTLE flexibility in the positioning of the screen (tilt, side-to-side, or whatever) in order to feel comfortable for long stretches of time.I went haywire with my 40" 4K. I actually custom built a rolling monitor cart from DendreCo on Etsy, 24" by 30" with 6-inch caster wheels (that was overkill) at about 32" high and a grommet hole in the center of the top to mount this on, in which I have placed this monitor arm supporting my Philips 40" 4K. If someone is interested and posts a comment below this review I will take a picture of it.It works perfectly. I have a mobile workstation (with a mini-ITX 'shoebox' computer on the lower shelf connected wirelessly). This arm is better than I was expecting. It is essentially perfect. It has a long reach, tilts, rotates, and twists, and is 100% solid and never sinks. And is very easy to adjust into all of its positions.I can lie on the couch, sit in a chair, and even stand, and raise and lower this monitor arm to pretty much any desired position. When on the couch, the cart is at the side but the monitor arm is easily long enough to reach the arm directly in front of my face and rotate to face me while I lie back on the couch arm lengthwise along the couch like I'm about to fall asleep on the couch. In that position, the forward tilt is important (and could be a bit more, but the current forward tilt is fine). It is easy to reach forward and rotate the entire thing out of the way so I can get up off the couch without any hassle - no hard force required.On *one* of the joints, there is a bit of sustained pressure required to change the angle of the joint - this is the joint at the very middle of the top bar - this does require two hands - and essentially this joint's only purpose is to make the reach of the monitor arm longer or shorter (it has nothing to do with the height, rotation, or orientation of the monitor, though it does impact these a little bit).This monitor arm easily supports the weight and torque of my 40" Philips 4K at any position - including fully extended.I have found myself using the monitor mostly in portrait mode because you can fit SO much text on the screen vertically that way. At first I thought I'd use a 4K to fit more APPLICATION windows on the screen at one time with the assistance of a program like Divvy for Windows (which I currently have chosen as my window layout management program for use with the 4K), but now I just take advantage of the added vertical space in portrait mode and typically just have one application filling the entire (huge) monitor at a time and Alt + Tab between them. But I'm going on a tangent, as this review is about the monitor arm.But the point is that it's easy to rotate the monitor between portrait and landscape with this monitor.Another point - where the vertical piece of the monitor arm (the long bar piece that actually sticks into the desk) meets the rest of the monitor arm - this can be lowered and raised, but requires a small hex wrench, so you won't do it very often. I personally have the monitor all the way to its highest position. The reason is that even from the HIGHEST position, the monitor arm itself raises and lowers easily, and in its lowest position the monitor drops well below the table top EVEN with the monitor arm mounted at the highest position. You can drop the monitor arm all the way down until the metal bar of the monitor arm bangs into the table top so that almost half of the monitor is below the lip of the table, even with the monitor arm mounted at the highest position. Because this is easily low enough, and because I sometimes want to stand up and work (using another small table to hold my keyboard/trackball), it's more important for me to be able to raise the monitor HIGH enough to stand and use it - and with the monitor arm mounted at its highest position and then extended to its highest height, it's easily high enough to work as a standing desk.This is a rock-solid monitor arm, absolutely no slop, highly and easily adjustable with one hand, and works great with my 40" Philips 4K. Highly recommended.