I have used the Irridium exclusively from day one. Yes, it gives 3 more HP, cleans the pipe out and lasts forever! Actually, I have used it exclusively fr 45K miles - change it out at 15K. Buy it at your local auto parts store- much cheaper that on-line. Never had any issues with them. Are they any better than regular - who knows? Why do I use it - because I like the technology associated with it.