Yup, we've seen the el'cheapo metal ones fail. The ones that look like they're made of tim foil and soldered togther are shit. The cast metal ones are good. The Stewart racing one is the best. The new ones from BMW are supposed to be made of different composite, and are lass prone to failure ... don't have any 1st hand experience though.
2007 BMW 328Xi Touring, 6 speed