So, is "Rock Band 2" worth the money? The answer is yes, but with a condition. If you loved the first game and are happy with the plastic instruments you already own, then just pick up the disc with all the new songs and modes on it, because the new instruments - while wireless and quieter - might not be worth the cost for the entire kit. But if you're new to the game series or prefer the new peripherals, then the entire kit is for you.
And let's face it - because the original game is only 9 months old, "Rock Band 2" isn't too radically different than "Rock Band" - so consider this game "Rock Band 1.5" rather than a true sequel. That said, gamers looking for a rocking thrill won't be disappointed with this purchase.