I have the GM LS Hot Cam in the 5.3 in my truck that I daily drive. I like it. It doesn't seem to be a well liked cam on the internet but I got a great deal on it and the matching LS6 valve springs. It sounds great and really woke that little engine up. I really like that it is a GM engineered setup. I have 80k miles on the setup with no difficulty and no need to change valve springs.