I have spent a lot recently on brake blocks after getting back into BMXing after a 20 year or so break, I'm a few stone heavier now, it's been a nightmare trying different brake blocks, and finding some that actually work, I'm more into flatland so I've been looking for something that works aggressively, these blocks really do work well, I'm now around 13 stone ish, and on painted alloy rims they work the best yet, every review I've read has been good, and they don't cost a fortune, they work really well, I now have around six pairs of brake blocks with hacksaw cuts that are useless, I know for next time.