I have this stool for more than two years now.
Basic stool, pretty comfortable although after longer use (2+ hours) my legs start to get numb. But I'm a heavy guy (100kg) so I guess this is normal :)
The wing nut bolt that holds the seat to the frame tends to loosen every now and than so it needs to be tightened regularly, but not a big deal.
All in all, I've sat on more comfortable stools, but this one does the job, folds easily, has great stability, and the price is ok.