Love it!
The only reason I did not give it 5 stars is that there should be a strap to hold the seat down around my office chair like there is for the back.  I have a slippery office chair and this slides around a lot, so I have to put it in the correct spot each time I sit.  Otherwise it is a great, comfy seat!  I am 5'4 and 130 pounds...if you are a large/wide person this seat may not be wide enough for you.  Works great for me!
Rating: 4 stars