I do not think that $3000 would be a worthwhile expense. But don't expect me to pay your repair bills if I'm wrong. That said, if it gives you peace of mind, go for it.
The only problem you can legally have from the tune is if it can be shown to have caused whatever went wrong, although I fully understand the hassle that you can go though proving fault. It would limit the risk to the driveline, so there is that. Of course you do have the option of buying the GMPP tune, which would be covered by the same warranty, since it is a GM "part".
Sky NA 2007 Midnight Blue
Sky RL 2008 Carbon Flash - Naked