Got the game tonight, it's great! GHTV is addictive and has a wide variety, and the Live videos work a lot better than I expected. It's fun to purposely mess up to see the reactions of your band mates (especially the first group in the barn, the lady with the tambourine slams it in anger as she stares daggers at you).
I wish the strum on the guitar wasn't so clicky, though, it's loud enough to be distracting unless I use headphones, and I don't want to play Expert songs late at night because of the extreme clicks that could bug people trying to sleep. My 6 megabit DSL is fast enough for a problem-free GHTV, so that's good (although the GHTV tutorial bugged out, it kept talking about things that weren't onscreen, and there was no Note Highway at all for the first song).
Question: how do you change the difficulty in GHTV? Do you have to reach a certain level first? I'm level 5, and I'd really like to switch to Advanced.