too bad you'll need the turntable controller. but i personally did buy this for my 360... it's awesome. best music game ever. i'm an actual dj, as my name would suggest, and though this is not a true 'simulation' of djing... it takes enough of the 'realistic' elements (especially use of the crossfader) that it makes the game just so awesome. the track selection is just awesome... it's nice to go across so many genre's (rock, dance/electronic, pop, hip-hip/rap). if you love your rhythm games, and want something different then the guitar, drums and mic... get this. note... this game is nothing like beatmania... this game is way better then that game ever was, and don't wait for 'Scratch the DJ' even with it's 'professional' Numark controller, the gameplay will not compare vs DJ Hero (as Scratch is a near direct ripoff of konami's beatmania).
And yeah, DLC is of course to just 'extend' the already large song collection of DJ Hero.