Ya. Just traded in Resistance in towards this last weekend.

That game actually makes me want a PSP again. I loved Frequency, and would love to play this game.

this game is ok, trust me ive played it.
if youve ever played djmax and gotten decent at it this will not compare, hell you might even call this trash.
my main gripe with this game is that there is no option to just stay on one track.
as for the challenging part of this game there is only one and thats switching between the tracks but thats mostly annoying (i dont like to sing or play bass).
if youve never played djmax then this is a great stepping stone to getting the hang of it.
but then again if you dont like techno or korean pop/hip hop then youll prefer this game.

EDIT: i love the first and second rock band so dont say im biased to djmax im just saying its a better handheld music rhythm game.
EDIT#2: ive gone back to play it some more and its pretty rad though the songs could be better, custimizing your band is great. so screw whatever i said about it being bad/annoying and buy this damn thing when it comes out!

This game is pretty good, I think its a little on the hard side, but, i remember Frequency and Amplitude being pretty hard themselves.