Hi Ben, thanks for your feedback. We will add more technical details and clarify the differences between objectivefs and s3fs-fuse.
ObjectiveFS is a log structured filesystem that we implemented completely from scratch. It is a POSIX filesystem and works with the existing Linux and OS X tools and software.
sounds like maybe they're just packaging s3fs-fuse and then charging for it "as a service"? they're extremely light on technical details.