I'm a bit pissed that there's only a $10 difference between the Wii and the PS3/360 version. Isn't the Wii essentially just a plastic houseing for the Wiimote?
hmm not really:
IGNGuitar Hero III for the Wii will be the "unique" one of the bunch as it's the only version that requires players to plug in a Wii remote before they can start rocking out.
The back of the Wii guitar has a compartment that's made specifically for the Wii remote. It only takes a few seconds for preparation before rocking: plug the connector into the bottom of the controller, rest the controller face down, put the wrist strap in the handy nook, and snap the compartment door back on. Easy.
This updated, wireless guitar has a few unseen features, most notably the ability to pop off the neck for easy storage (and presumably upgrading purposes) as well as the ability to take off the faceplate so you can swap on available, customizable replacements. The device has been improved since the past versions of Guitar Hero: the "flapping" sound of strumming has been muffled significantly, and the buttons have been slightly modified with slightly smaller and slicker buttons to make it easier to maneuver along them quickly.
Along with the storage place for the Wii remote, the Wii version of the guitar has one other addition: an analog stick. Why? Well, when your Wii remote's plugged into the guitar, you lose the Wiimote's pointing ability - the analog stick is for players to maneuver the Wii's menu system so they can select the game while the Wiimote's properly plugged into the guitar.
What the Wii Remote/Guitar combo gets the game is, naturally, the inherent ability to be a wireless controller right out of the box since it's essentially using all the wireless tech in the remote to talk with the Wii system. The motion detection for when you want to trigger the star power in-game (by lifting the controller) is now provided by the accelerometer within the Wii Remote. But this combo also adds a couple of features that won't be in the other versions of Guitar Hero. First: rumble. The Wii version will be the only Guitar Hero game that will feature force-feedback thanks to the rumble in the controller, and believe it or not, in our hands-on, you really could feel the guitar shake to the beat when you rocked out with Star Power, as well as "buzz" when crazy effects are going on in the game.
The second feature? The Wii Remote speaker is used for the game's "squelch" when you miss a note. Hearing it come from your guitar makes two player co-op and two player competition a bit more fun since you can easily tell which player's the one that's screwing up the notes - if player one misses a few notes, the "squelch" will come from his guitar and not player two's. Players can bring the squelching back to the television speaker by turning off the remote's speakers - since the mis-note sound effect is integral to the game, it will recognize if you've kicked off your Wiimote speakers and send the sound back to the main audio output.