GREAT PRODUCT - EXCELLENT CUSTOMER SERVICE! I have been using the TrekDesk for about 6 months and have more energy and my back pain is a thing of the past. I used to sit all day at a desk and this has made a healthy difference in my life. Surface area is large so I can have my computer, files and room to write. I had to take it down over the holidays to make room for guest and 2 knobs got lost. I emailed customer service and got a same day resolution. Highly recommend.