Anyone to mention bashing the keys, sure you could do it, but you wont ever get perfect doing so. Playing correctly will allow u to get 100% rather than a cheated 90% (which is what you should strive for)
Just a small comment, to those who say it is NOT synced, you must click the arrow keys when they are directly in the middle of the line to have them sync up.
Don't judge sync-yness. I think I know how to sync rhythm games by now.