The Brake Bias thread lists almost every kit, and even mixed kits. It tells what they do to the bias.
As far as reviews, you will have to look for reviews in threads where folks installed them. Sadly, there are so few folks out there with them, I don't think the reviews would be good. Folks have simply only driven one BBK usually, and a lot of those people didn't fully upgrade the stockers first.
Personally, I have driven an STi Brembos (Carbotech Bobcat pads, 2-piece DBA rotors, lines, and fluid). I have driven my car with a fully upgraded stock set-up (2-piece iON Front Rotors, Endless SS-M pads, fluid, lines, and the rear racing brake stock caliper BBK). And lastly, I now have a front and rear Stoptech/COBB set-up (I have used Cobbs pads and XP-12s F/XP10s R) My review is as follows...
STi Brembos
I liked them, but they were a little more on/off then I expected. I don't know whether it was the pads, or a poor Master cylinder/piston size choice by Subaru, but these were the hardest of the 3 to modulate. The did not fade until about bedding in # 10 when doing 100-5 mph stops. At this point the fronts were smoking and the rears were hot.
I give these a 7-8 out of 10. These will be lower or higher than the set-up below depending on whether you value a stiff pedal, or modulation.
Fully Upgraded Stock Set-up
Modulation on this set-up was 100 times better than the STi. But, more pedal travel was required for the same amount of stopping force. In the same 100-5 mph bedding procedure, this set-up had slightly less fade than the Brembos above. Also, all 4 corners were smoking, but the front were smoking more. I attribute this to the larger rear set-up which shifted more to the rear. I also think the iON 2-piece rotors have better cooling than the DBA 2-piece rotors.
I give these a 7-8 out of 10. These will be lower or higher than the set-up above depending on whether you value a stiff pedal, or modulation.
http://i41.photobucket.com/albums/e257/praedet/Rotors/iONFrontInstalled1.jpg
http://i41.photobucket.com/albums/e257/praedet/Rotors/Racing%20Brake%20316mm%20Rear/RacingBrakeRear316mmKitInstalled2.jpg
F+R Stoptech/COBB Set-up
Let's see, the pedal travel is shorter than stock, but these have great modulation. The pedal is much stiffer than stock, and a good bit stiffer than the Brembos. During bed in w/ the COBB pads which do not have as high a temp range as either the SS-Ms or the Bobcats, I did not get fade in the first 10 100-5 mph stops. During the next 5 from slightly above 100 down to about 10 mph, I started to see fade at 3 and it was the same as the other two by the 5th, or 15th stop. At that point all 4 corners had even smoke coming off of them. I never encountered fade at the track with the XP10/XP8 combo, and that was running back to back sessions w/ no rest unlike everyone else. (About 6 sessions total through the day) The two of us driving the car were not running easy, and we were using almost every bit of the Hoosier R6s on the car. After the back-to back 20 minute session, the brakes were hot, but not smoking at all, and I did not have any air in the lines after a bleed One slight drawback is that the smaller pistons mean less pedal travel. That combined with a high mu brake pad and rediculously stiff calipers mean that heel toeing is MUCH harder
I give these a 9.5 out of 10. These are much better than the other two, but whether they are worth the price is up to you
http://i41.photobucket.com/albums/e257/praedet/BBK/Install/FrontInstalled1.jpg
http://i41.photobucket.com/albums/e257/praedet/BBK/Install/RearInstalled1.jpg
From driving other cars, and feedback from some friends, I would rate most brake kits like this...
1. AP Racing/Stoptech (Both great, AP Racing has a better heritage)
2. Brmebo
3. Racing Brake
4. Wilwood Kits
