I love them, I have one at work and three at home. I end up standing about 80% of the time and I feel that I'm more productive when I'm standing. When I sit at my desk, I tend to try to get comfortable and slouch a little in my chair, which makes me want to be lazy.

A big plus I found is that at work, it is much easier to show someone a coding problem or something I'm working on if the desk is at the standing height. It's kind of like working on a whiteboard.

Both my wife and I have adjustable desks for our home offices, and my wife doesn't even have a chair with hers, she's always standing.

I was able to get a used one from my last job after they remodeled our offices. I'm going to use that one for my garage workbench. I weigh 230 pounds, and just for fun, I wanted to see if the desk could lift me, so I sat on it and my desk had no problem going up and down multiple times. That made me have the idea it would be a perfect workbench for working on my motorcycle or car parts.