My lifters failed at 7,400 on a new Tahoe. After seeing how common this is on various forums, I dumped it. Sure, it might be fixed under warranty (how many times?), but the inconvenience with no loaners, and my fear of my family being stranded on a highway trumped all. I sold back to the dealer for $1,500 less than the purchase price seven months later. Yeah, I'm out sales tax etc., but I now have a new vehicle that I like better and have confidence in. GM has done NOTHING to proactively address the issue. After all the research I've done, I'm convinced it isn't bad parts (would be easily resolved via recall). And the fact that there are failures after the initial repair strongly suggests to me this is a design/systems issue, not faulty parts.
If your service advisor is honest with you (as mine was), you will understand that this isn't a "minor" issue being blown out of proportion. It is happening to a statistically significant number of new vehicles. Chevy/GM fanboys can deny all they want, or they can say they are happy to rely on the warranty, but that is false confidence in my view.