i have just got it, on PC too so i was expected issues getting it to work since they messed up the PC release. Lag is pretty good, slightly off without tweaking anything but quite usable.
for £35 i get a usable fun game and a cable that may come in useful for other stuff since it works as a PC interface for other stuff
the interface is odd, but can be adjusted.
its not perfect but it feels more useful than a guitar hero style game
i dont like how it ramps up the difficulty. you get something right, feel good... then the game slams you down again.