Would it be any good for somebody that's been playing guitar for 15 years already?
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If I take 15 years of experience to mean that you are pretty good, then no, its probably not going to be anything to build your skills much, more of a game for you. But, it might be good just to improve your timing if thats an issue for you. It has a bunch of lessons, but I havent looked at the more difficult ones yet to say if they are tricky enough to be worth your while.