PowerTunes
Full user review
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"Behaves strangely and dangerously"
Pros
Nice feature set in principle.
Cons
Bad things happen. It causes iTunes to act as though it is being opened for the first time, showing Agree to Terms window. iTunes opens with preferences reverted. When moving playists PowerTunes froze and some songs became delinked from their files.
Summary
Very risky in my short experience, with the possibility to create havoc. I have a large library of songs and would never use PowerTunes again.