I have a pair of Vuelta wheels on my old Specialized Rock Hopper. Not the same set you link to in your post - I have the Comp MTB set. I bought mine on ebay a couple years ago, maybe from that same seller actually! As far as the quality, I cannot complain at all. They have been great - have stayed true and took a beating from my heavy butt on the bike. The ones I got have hubs for disc brakes but my old bike had rim brakes - and the Comps worked fine for rim brakes too. (Not sure about the set you mention) One other thing about the Vueltas (at least the ones I have) is that they use flat spokes instead of round spokes. Not sure what the pros and cons are of that, but I am sure Vuelta has some good reasons for it. I am no expert, but I think Vuelta traditionally does more with Road Bikes than mountain bike wheels. But like I said, I cannot complain at all about the set of Vueltas wheels that I have.