This Varidesk model came assembled in the box, so a couple swipes with the box cutter and a herniated lumbar disk (it's heavy) later I was smugly standing at my desk while my seated co-workers gossiped behind my back. "What a leader!" I thought I heard one say admiringly. Or was it, "What a dork!"? Whatever. We'll see who's laughing when my "Skip the Gym--Stand at Work While Staring Blankly at Your Monitor" fitness book hits the market. But I digress. The unit really was very easy to set up and to operate. The up/down function is super smooth and locks into position easily at your desired height. I'm about 5'10" and find that the desk is quite comfortable when extended; and I have to say it feels pretty good to be able to stand for periods during the day. And I'm told that the bald spot on the back of my head isn't as noticeable when I'm standing. I went with this model over less expensive ones because it has a large surface area and some features that I like, such as a belly curve versus straight edge on the keyboard tray. I gave it a 4-star rating because of the price and because when fully extended/raised the unit is a little wobbly--not "fall down and smash your feet" wobbly; more like "Dang--for that kind of money I wish this thing wasn't so wobbly" wobbly. Overall? Happy.