Ignore the text about a maximum of 20lb. When you get it, it's actually a MINIMUM of 20 lbs required. 20lbs is the balance point: if you have less than that, it stays permanently up. But if you have less than 20lbs you can take out one of the springs. Of course, most woodworkers using it for it's intended purpose use 20lbs of hardwood, but I use a jerry rig that's much lighter. Then I added a 30lb 30" monitor, and it works great. The springs lift 20lbs, so you only have to put in 10lbs of effort to lift 30 lbs.
I'd worry about adding a lot of heavy weight to the front of it where there is more leverage, but I wouldn't hesitate to add another 50lbs to the back. This thing is solid.
Of course, it's a fixed travel distance. But if your monitor also has a little bit of height adjustment as well, it'll work perfectly.
It's not just about monitor placement though. Keyboard height, at least for me, is more important for a comfortable computing environment that monitor height.
Just checking now, I've got about 18-inches difference between my seated keyboard height and my standing keyboard height.
Interesting. I actually appreciate the low standing keyboard height in my setup. My setup is far from ideal, but does have some advantages.
META: why is my 5 ranked post at the top? There's more interesting posts more highly ranked further down. Because it has more comments? To those who care, I think `javan`'s post is the most relevant for somebody looking to make a cheap & easy desk.
http://www.leevalley.com/en/hardware/page.aspx?c=&p=4057...
Ignore the text about a maximum of 20lb. When you get it, it's actually a MINIMUM of 20 lbs required. 20lbs is the balance point: if you have less than that, it stays permanently up. But if you have less than 20lbs you can take out one of the springs. Of course, most woodworkers using it for it's intended purpose use 20lbs of hardwood, but I use a jerry rig that's much lighter. Then I added a 30lb 30" monitor, and it works great. The springs lift 20lbs, so you only have to put in 10lbs of effort to lift 30 lbs.
I'd worry about adding a lot of heavy weight to the front of it where there is more leverage, but I wouldn't hesitate to add another 50lbs to the back. This thing is solid.
Of course, it's a fixed travel distance. But if your monitor also has a little bit of height adjustment as well, it'll work perfectly.