I didn't know exactly what to expect when I bought it, but it is a product that meets the stated purpose very well. Moving it up and down is easy and the most important thing is that it feels very stable. 
The only thing is that it is a bit heavy, so don't put it on any flimsy table or your lap! But I also believe that you need the weight to have it be a stable platform when you are working on it, especially when extended up