Does anyone have an experience with the two of these? They are both decent looking pieces (from the manufacturer's pics) but one is aluminum and much thicker than the other. Also the aluminum seems to be roughly 30% lighter despite the vastly thicker material, not that 0.9lbs is much weight.

I'm basically just wondering if there are any reports of failure on either unit as I do plan to do a few track days eventually.

BTW car is a 2002 TA and I'm going to C6 (base) caliper's and rotors, front & rear.