I use Black Pearl HP and have been since they started making it an I have not had anything bad at all. Never one car returned. Just started using Black Pearl Nano Ceramic IR and so far I love it as well. I can't honestly speak to it's longevity because it hasn't be out that long but so far so good. The Black Pearl NR is a lower line but if you stick with Black Pearl HP you should be OK. As far as Black Pearl Nano Ceramic IR, like I said so far so good, I guess only time will tell.