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Full user review
"DO NOT INSTALL OR BUY"
Poorly executed. As of today, DoubleTwist duplicates (many people's full library of) songs from computer to phone. What's worse, there is no easy de-dupe option.
Those in the Android and Windows community need a product like this, but until the developer fixes the duplicate problem-- they have been promising a fix for over a month--this is one application you should avoid.