I decided I wanted a stand up desk several months ago after reading a couple articles on the health benefits. I found some cardboard boxes around the office and propped my 2 monitors, laptop, and keyboard on a makeshift stand up desk. That worked great for a couple months! The first week was the hardest, but it quickly got easier. The biggest pain was the fact that it would be too much work to disassemble and reassemble it if I wanted to sit for a short amount of time. So I just stood all the time, which wasn't convenient. A couple weeks ago, my cardboard makeshift desk collapsed in on itself. Fortunately, there was no damage to anything, but that incident convinced me it was time for the real deal. I'd been standing long enough to know it wasn't just another one of my whims.
We ordered this desk and it came a day earlier than anticipated. Setting it up was cake. There's no assembly. I got everything setup in 15 mins, and it was back to work. I love the desk. I'm 5'10" (1.78 meters), and this desk is the ideal height for me at it's highest setting, so I can understand why taller people have given the desk negative reviews. My review may not have been as good if I was a couple inches taller myself. For my height, it's perfect. I've posted a couple pictures so you can get an idea of what it looks like. The second picture I posted shows how the desk looks next to me, a 5 foot 10 inch guy.
Some have said the desk is unstable. The monitors do shake a little when I pound away at the keyboard, and I'm detracting one star for that. I wouldn't call it "unstable" though since I don't see any chance of it falling or of anything falling off of it. It's only a minor inconvenience. I adapted quickly. It didn't bug me much considering my last desk was cardboard :) I do recommend this desk for people that are my height or shorter....and maybe an inch taller.
Being able to easily switch being sitting and standing is a big plus! Standing for too long has it's risks as well (varicose veins).