As a bit of an old timer, who also has a slight disability, playing the console versions of Rock Band or Guitar Hero are ruled out, not to mention how being an old timer playing a pretend guitar looks to the rest of my family :P So, being an avid PSP user (For new games and being able to play old PS1 games on it) I took a look at the demo of this and then decided to buy the game (although not from Play.com this time - sorry play :O)
So, how does the game play? For starters the various modes are cleverly worked out and implemented well considering the PSP's button layout. Playing in the survival mode with all 4 instruments (Guitar, Bass, Vocals and Drums) is a lot of fun, simply requiring a press of the L or R shoulder buttons to switch. It is quite challenging on harder modes too.
The other modes are also nice to play if you want to chill out a little you can take the difficulty down to a point where even the least talented can play it.
In response to a review earlier, DLC stands for "Downloadable Content". As it stands now, there are about 10 tracks on the PSP Store you can add at 99p per track. The plan is to release new content every two weeks, which is good for a handheld game.
I have a long train journey coming up next week, and I'm hoping it will fly by whilst rocking out to this game :)