I did save up for Guitar Hero II and it arrived last week. I did the tutorials, played half a song and then my Xbox fell over. I was gutted. There I was with my "guitar", ready to rock n roll and instead I found myself staring at three red lights.
The good news (for me as a customer) is I'm covered by the warranty extension and the support experience was surprisingly good (no waiting, clear instructions and a shipping label sent via email).
My Xbox is now recuperating in the Xbox hospital. All I have left is a GHII guitar with a trailing lead; it's not quite the same. Get well soon Xbox! We miss you.