I have extensive experience with Stoptech BBK both on road and track.
I had a 2006 BMW 330 (e90) that I drove daily and would track anywhere from 10 - 25 days a season. I had the 6-piston, 355mm front and 4-piston, 345mm rears.
It took literally 5 minutes per corner to swap over to track pads and the compounds that are available are endless. I ended up really loving Pagid pads for the track. I ran a harder compound so it wouldn't chew up my rotors and quickly, plus, my car only made about 265HP, so it wasn't the quickest car down the straights.
On the street, I'd run the standard Stoptech pad. Plenty of stopping power and quiet.
I literally had them on my car for eight years, put about 55,000 miles on them and NEVER had an issue.
The car that I ended up racing was a 2008 BMW 335. It had a Dinan tune, so it made about 390HP, which doesn't sound like a lot, but in SCCA or AER Endurance racing, it had more HP than most every other car out there.
We ran the exact same setup as I had mentioned above. The Pagid RS29 pads would last a full 12 hour endurance race without any issues. We'd hit about 140mph down the front straight, every lap (we'd run around 426 laps in the entire race). Again, we NEVER had any issues with brakes. The stopping power was incredible. We ran at Mid-Ohio and I hit 155mph on the back straight, slowing down to about 45mph. Never any issues slowing down a 3200lb race car (I know, it was a fat pig, but we got it to work).
The wear on the rear brakes was kind of funny. We could probably run two 12 hour races and still have pad left over.
The nice thing about Stoptech is they aren't super expensive compared to other brands and a big deal is the size of the caliper. They have a pretty low profile, which gives you a little more freedom with wheels.
The pic below is of me at the 12 hour Devil in the Dark at NJMP. We started 49th and finished 5th. Yes, the brakes basically glow like that on every lap and there is never any issues with brake fade or a soft pedal.
LMK if you have any questions.
