my buddy and I made some rounds to best buys today, and played a few demo units. we couldn't get the sound and video to synch at the first one, so we moved on. the guitar at the second wouldn't register downstrokes (interesting), but the drums were fun nonetheless.
I can't say that I like the feel of the guitar at all. I would like the buttons to be more raised, and more responsive. the buttons further up on the neck were pretty much useless because I couldn't find them when I wanted without looking. granted, that will be easier as I get used to it, but the fret before the buttons acts as kind of bar to keep me from sliding down. also, the five raised dots on the middle button isn't nearly as helpful as the raised bar on the middle button on gh controllers. I can always count on that bar to help me find the center again. overall the guitar just feels cheap, as many others have mentioned.
the songs I played on guitar weren't very fun either. if any of them were on guitar hero they would have been skipables. I know they had to pick songs that would be fun for all instruments, but it's too bad that means sacrificing so much fun on the guitar. I was hoping this would be the music sim to end all, but it looks like i'll still need guitar hero to get my guitar fix. thankfully rock band's drums are a blast.