I like how easy it was to set up my S3 buckets for different projects. It's also nice that they can be used across multiple AWS accounts without having to create separate buckets or even worry about permissions issues. Their customer support is very good; they helped me get things setup correctly when I first started using them but once you are past an initial learning curve everything becomes pretty self explanatory. There isn't anything specific I dislike at this point. The only thing I would mention is that their pricing model could use some improvement. They don't make it clear what all costs will include until after your trial period ends. Our main benefit so far has been the ability to easily manage our storage needs while still being able to share files between developers.