I hate syncing my Fascinate with my computer. Almost more than anything. Data sync across two computers, a laptop, a chromebook and an Android phone is a nightmare.
I currently serve my media off of SubSonic but the interface is tired, the API is restricted and pay-walled, and the Android app sucks. Amazon solves all of this.
I definitely will be using it. Plus I can buy cheap-o Class 6 SDcards.