Shimano UN55's are known for lasting many 10's thousands of miles in all kinds of riding conditions. I have yet to kill one. I also have a QB55 in one of my bikes and it runs fine too, no problems whatsoever, although I haven't run it for many (10's of) thousands of miles yet to be sure.

The 10 year warranty on the QB95 is neat, although you could buy 4 UN55's for that price.