Personally, I love this game. I have the iOS and 3DS versions already, and the one for PSVITA is definitely the best one. Why, you ask?
+ Better sound quality (do yourself a favor and wear good headphones!) + Better graphics (on 3DS background dancers and effect were only silhouettes, on iOS the resolution was lower) + More dance moves in freestyle mode + Timing of the gestures you have to perform seems to be spot on, also they differ slightly from other versions + Trophies! (easy/medium Platinum difficulty)
I didn't notice any stuttering which was mentioned in another review. Game plays absolutely smooth. If you are familiar with Michael Jackon songs and like them, you'll have a great time playing, because you know exactly which beats and sound effects are coming up, therefore it will be easier for you timing the gestures. But even if you are not that big of a MJ fan, you still can master the game. It's also your chance to listen to some great tracks.
For the price I would recommend it to anyone who likes rhythm games in general. FYI, the Platinum trophy took me 2 days.