Review: Samsung UpStage
Although Sprint told us they don't expect anyone to replace their hard-drive based MP3 player with an UpStage, it's clear they do expect people to use it as a music player - at least for short trips around town or to the gym. While it represents a leap forward for Sprint in terms of music on a phone, it still cannot compete with most other music focused phones from other carriers.
The two-sided form factor is eye catching, and will doubtless provide buyers with a certain cool factor, but two sides are not better than one. There are other eye catching phones on Sprint which would be much easier to use, even if the music experience isn't quite as good.