My first impression after sitting in a chair which continuously lowered itself and me to the near floor level was WOW! There I was sitting at the proper and comfortable height seat! Then I found the seat so slippery that I had to hold on to the arms of the chair to scoot it up to the desk! The wheels are the complete opposite of those hard to wheel on carpeting usual wheels that are on desk chairs... a bit too much the opposite~
BUT - it occurred to me to try placing a sheet of the rubber woven matting that is used in kitchen cabinets for dishes and glasses to sit upon. Well, the change was magical~ no longer am I sliding out of the seat and I am still sitting nice and tall~ another plus, when one is not sliding out of the seat, those slick rolling wheels are just RIGHT~ 
So, really with my modification to the seat surface the chair warrants a 5 star rating and yes, I would definitely buy it again!