I absolutely love my Sierra (It's black)!
Between a grumpy, green horse and a ditsy 4yr old (boy, I pick good horses! LOL), I always ride with it on. It's well ventilated, so even in the middle of summer, I am not dying of heat.
My horse dumped me and I hit my head very hard, Troxel replaced my Sierra for a small fee. If you buy it new and send in the reg. Card, they have a replacement program where for a small fee, you get a new helmet if you "use" yours by falling off and hitting your head. Knowing that should I get dumped again, my helmet is new and safe, was worth the small fee.