Ive used yellowstuff/Ultimates. Ultimates only lasted 2 trackdays so wanted something a bit better that would last. Brake performance with the yellows was pretty good, never had them fade even after an 11 lap stint at end of the day. I got them because they are supposed ot last twice as long as most comparable pads, I am much too lazy to swap them out. They seem to work ok on the road as well, just dont expect to stop in a hurry in the first couple of km, just a bit noisey as well. In saying that I had no real issues with the performance of the ultimates, they just turned into dust after 2 trackdays.