Iv'e used mine on a few trips up to Mammoth. Thus far it's been great (even though I never fall)... No but really, it has stayed in place, and givin me good protection when needed. Another thing is it's got great air flow so it's not hot at all. ..(besides the kidney belt) Also it's nice being able to remove the elbow pads and everything else for both riding and cleaning. Get one.
I havn't used one but I'm thinking about one. I've used a set of rockgardn knee/shin pads for 5 seasons and they're still running strong. Same with their gloves. Built strong and last forever! I suggest you buy their stuff.