Summary: Amazon's delivery was perfect, the game itself is quite fun and includes wonderful tracks, and I couldn't complain about a thing. Always a pleasure dealing with Amazon and of course the Rock Band/Harmonix franchise.
Summary: Although this works as a standalone Rock Band game, you shouldn't get any of these track packs as a replacement for the main games. They have a quarter of the songs and half the features. You won't be able to play online or make your own characters.
Summary: I like this concept a lot. It's a disc for people that don't have internet access via the Xbox 360. For those that do it allows it to be added to the main Rock Band or Rock Band 2 library. Now here's my problem with it. I'm individually downloaded most of the songs on this disc already.
Summary: This is probably the most solid track pack out there. Most quality songs cost $2 a piece, so 20 for $20 is a great deal. Just don't buy it used, there's a one-time code in these that will allow you to import the songs into Rock Band for free (after the cost of the pack).