I was skeptical about it when it came in such a small box.  I thought how am I going to put this thing together and still have the height adjust.  But it was actually very easy to assemble and the height adjustment works quite well.
It is not a chair for extended sitting, but it serves it's purpose for me which is an occasional sit or a half sit/half stand position.  I have a standing desk in my office and sometimes I needed to sit, but then I couldn't reach my computer.  So this stool has helped me to be able to sit briefly and still be able to work on my computer.

Pros: Great value, easy assembly
Cons: It smelled bad for the first few days, but then it was gone.