Given a) the threat of higher gas prices and b) the possible insolvency of GM, you'd best think this over.
If GM goes Ch. 11, you're probably okay with warranty and service, but if they file Ch. 7, you now own an orphan and the warranty goes up in smoke.
Personally I don't believe ch.7 is in GM's future, but you never know. I'd be more concerned about possible punishing fuel costs.
If you are very rich, disregard this notice about fuel and just focus on the warranty issues.
Why not consider a slightly used one. I bet you could score a year old H2 for a fabulous price right now.