It feels awkward scratching the blue button as it's the closest to the middle of the turntable and therefore doesn't have a very big turning circle. Also, you don't get different stars for different difficulty settings, which is odd considering it's made by the same people that made Guitar Hero and also rather annoying as it means you could just as easily get all the stars in the game playing it on beginner mode.
But these two things are certainly no reasons for you to not go out today and pick up the game. For all you people out there looking for a new, fresh music game; pick up DJ Hero today. You won't regret it.