Amazon has a history of creating web applications (I'm thinking about their MP3 cloud drive) and then seemingly abandoning all further development. Either they have small teams of developers that move from project to project, or it is outsourced.

I'm not confident in Amazon's long term approach to these products.

I'm a advanced-amateur photographer and half of my photos are RAW format, not JPG's. I'll be surprised if this offering supports any format besides JPG.