my old man runs a 120mm qr15 float on his and has a fairly light build but nothing ridiculous; still uses 2.35 tyres, no carbon bits, hope brakes and his is 26.5lbs. its a great xc trail bike, really flatters his strengths-smooth, flowy, pedal all day type stuff.
my brother has an older one (my dads old one) and absolutely canes it. not sure how long it will last, he has taken it to the alps, snowdon etc and definitely pushes it to its limits; dented frame, stretched bb threads, new pivot bearings regulary etc. but he cant afford to replace it and with a short stem, too long fork and wide bars he has changd it in to a bit of a play bike anyway.
basically its a very versatile bike!