OE Bilstein's are sh*t. We broke both of the rears ones on our GMC Yukon. I know of some people who broke their Bilstein's on Land Rovers and Chevy trucks. It is the 5100 Series (OE) that is crap. The 7100 and 9100, on the other hand, exhibit exceptional build quality. The 7100/9100 Series are the same ones used in Baja races; they have proven them selves to be very reliable. The best shock, in terms of build quality and price, is the Old Man Emu Nitrocharger shock. I have never heard of one complaint with these shocks.

Cheers,
Mel A.