Neubar, my initial impressions have been very positive. It's been bitterly cold/snowing up here so I haven't had much grip (even with snow tires) so right now I can't even come close to using the full potential of this setup. I'm running Porterfield R4-S pads and this brake setup definitely has much more stopping power than my old 302s with OEM pads. With the 302s, I was never able to get ABS to engage on a dry road at highway speeds. With the BBK, ABS has been easy to engage. And these pads just get better the harder I drive, I'm a fan so far. I'll be sure to report back once they've been properly driven on with summer tires at autocross! Brandon, my V12s aren't wearing as well as I hoped, but given that I don't drive a lot (typically ~8000 miles/year) and I run snow tires in the winter, I'm ok with trading tread life for grip. I actually think the sidewalls are fairly soft compared to a number of competitors tires, and that's why they actually ride pretty comfortably given their performance capabilities. I also noticed a decent amount of roll-over under hard cornering during autocross if I didn't have the pressure fairly high (40+ PSI) when hot. Overall they're a good street tire but not the best for autocross. In the pic below my tire pressure was low, and you can see the tire noticeably deforming under load: