Stylish, Brutal, Love all of it. Definitely requires some time to get good, but anyone who grew up with games like FFR and PaRappa are going to immediately see value in the difficulty.
I'm absolute garbage at these kinds of games when it comes to how precise the timing is, but I'm willing to put the time in considering how enjoyable it is.
EDIT: God, when you start getting it and beating the hard stages, it's so rewarding. Can't wait for more music to be added.
EDIT (again): Dear god. the way this game has evolved is beyond anything imagined. Incredible fun still, but the continuous support and flair is EVERYTHING. So damn good since I first played with just the 2 weeks, had to give that last half point.