I have the
Uplift 900. My company was very generous with the desk budget, so I went all out and got an 80" wide top. The 80" width is big enough for all my work, but if I were buying it again, I would *not* buy the desk top from Uplift. The price is too high for the quality- I think it probably costs a fortune to ship a big heavy desk top. The digital memory keypad is well worth the money. The Uplift castor wheels are also worthwhile. The Uplift keyboard tray is solid, but nothing special. There are better keyboard trays out there, and I definitely recommend getting a keyboard tray. The cable management kit is overpriced and next to useless.
Keep in mind that at standing height, the desk does have a little bit of wobble, especially if you use the castor wheels. My monitor was unsafely wobbly and I had to use a wood clamp to clamp it to the desk for safety. Part of this is due to my monitor- for a 28" screen, the included stand has a small (too small) footprint and odd weight distribution. For most monitors this probably won't be a problem.
I tend to stand until after lunchtime, then sit the rest of the day, depending on how heavy a lunch I eat. My back problems from a car accident 2 years ago have nearly disappeared. Best feature of a standing desk is eating lunch- your lap isn't in the path of falling food objects. If there is a spill imminent, you can simply dodge out of the way. I haven't spilled lunch on my pants since I got the desk.