I just recently paid £21 for the full version of Tab Pro which is a part of Ultimate Guitar.
My life is now complete especially since I've got to learn 24 songs for a band I'm going to be gigging with.
Is it worth the £21? I was looking to get it too, but didn't realise that you had to pay for it (no idea how).
I recently paid for the full version of guitar pro and thought it was excellent - about time after my years of using tux guitar.
You still have to use your ears though - sometimes tabs, even those rated over 9/10, are obviously wrong, to me.