For those interested in just the guitar+game, that is on sale right now for $40.
Both bundles come in at a steal for these low prices; Rock Band 4 launched at an MSRP of $250 for the full band kit. Rivals, a recently released expansion, adds the much anticipated online multiplayer feature as well as a new campaign to work through that changes aesthetics in favor of a more realistic look. Note that the old World Tour mode is still in the game. Anyone on the fence, well, this is the best opportunity you're gonna have to pick it all up for cheap, brand new! Something else to keep in mind is that once these instruments go out of production, they appreciate in price! This has happened particularily with the les Paul guitar and the rock band drums though the latter won't jump in price again until production ends (the les Paul guitar is the one that shipped with guitar hero 3, the most preferred guitar controller for top players and sells for a cool $250 new on PS3/360).
Its also worth noting that Rock Band 4 works with all legacy rock band instruments across the same platforms, as well as almost every guitar hero controller except the PS2 ones (although with an adapter that can work as well).
if anyone has any questions regarding the game, I am happily obliged to answer
edit: Personally I'm ordering the full band kit for back up instruments and spare parts. It's just too cheap to pass up.
