Right, first off this is a well made item. I cant see it breaking any time soon.
However, when I first got it I spent ages trying to adjust it to get it right for me, but just couldn't get comfortable on it. I noticed the seat part is slightly sloped downwards and I kept slipping off it. The next thing I found was that you could easily fall forwards. (it actually happened that while I had my eyes closed playing the guitar, I fell forward and almost broke my 2500 euro taylor!!). Also what happens is your weight is on the front part of the seat, and the rear starts to fold in (like its designed to for storage/transport), this really isn't a good thing when you are sitting on it!
I ended up getting a grinder to it, so that the rear support went back further and it made the whole thing more stable.
I have this a good while now, and have gone back to an ordinary stool.
Its not cheap, and really I think it could be better designed.
Lastly, Its quite heavy, so if you plan on carrying it around with you, forget it. Though weight isn't an issue for me, as its left in one spot in my living room. Personally I couldn't recommend it. I can see this being consigned to my attic eventually.