I was looking at a local bike shops web page yesterday when what do you know along comes a bike that looks good. the kona sutra seems to have everything the trek 520 does, 700/32s, 52/42/30 chainrings. a 44cm chain stay. unlike most of the 520s it does have sti shifters. and unlike any tourer i have looked at it has disc brakes... what i would like to know is; has anyone ridden a kona??? or specifically a sutra and ; has anyone used disc brakes before? it would seem to me that i would be afraid they would fail on a down hill under full load conditions.. anyone??? thanks..