Hap
Hap reviewedDoppler for iPhoneA better offline music experience for iPhone
 RecommendedPros: 

Clean, beautiful design, that fits the mood of whatever album you're on.

Cons: 

None.

Been waiting a while for this to come out, love that there was zero time spent having to manually transport my music over from an app I hate. Downloaded and immediately ready to go.

Hap has used this product for one day.