I got the game today (posted from US, £22.50 import tax!), I like it. The guitar comes with a longer strap so you can have it as low as a real guitar if you want. It is also heavier, which I like, although the fret buttons seem a little more stretched out than on the SG for PS2. The game itself is excellent. I started on expert and the first song I got stuck on was the Tom Morello boss battle. I'm working my way through to Knights of Cydonia now.
I guess this clears up any worries about Non-Region Free games on the PS3, but the online is a acting bit weird at the moment, I went straight into a quick battle (and lost), but now it won't connect to anyone.