I've heard good stuff about them, I've heard they buy from far eastern manufacturers that are used by the big brands and then sell at a good price. Their wheels came in for a hard time a few years ago, as did their customer service - but I've heard nothing but good stuff since.
Only used them for grips recently, but friends swear by them for disc pads.
I've had loads of stuff from them. Pads, grips, chain guides, pedals, wheels etc. All of it has been totally faultless (well, the first lot of pads i got were a bit crap, didn't fit the caliper very well, seem to have sorted that now though).