yeah i was reading about it in the metro

(im too stingy to buy a paper) and they said it was good

some of the features listed on play.com:

"Authentic Rock Star Experience:
Takes full advantage of Nintendo DS capabilities, including activating star power by yelling

"Rock Out" into the DS microphone
Attacks in Guitar Duel allow you to utilise the DS in a new way
Blow into the DS microphone when the touch screen is set on fire in pyrotechnics
Sign an autograph when it is requested by an excited fan
Fix a broken string by dragging the broken ends together
All of the customisation and personalisation Guitar Hero fans enjoy:
Select from six characters including two new rockers, which are exclusive to the DS
Choose from a vast collection of guitars and all new musical venues"

I'm going to listen out for people shouting

"rock out" on the way home tonight and count how many lol