I have it for the 360 and every weekend I have friends who want to come over and play it. The game is tremendous fun with friends specially f you have everything to play 4 player but is kind of boring if you play solo. Guitar sections are way to easy compared to Guitar Hero. The initial price never bothered me since your getting the game $60, guitar $50, drum $50, mic $10, usb hub $5 all in the box. The DLC is great but this game gets expensive fast because of it.
But I'm not surprised thats its not coming out yet since you can't buy seperate 3rd party guitars for the wii and heck they have not even gotten the bundle out yet for the ps2 version. I think part of the problem is the guitar issues they had which has caused them to redesign some of the hardware.