The initial setup was confusing, though I appreciate it's offering configuration that's not possible with a service like Dropbox.
Almost all the time, files are synced to the other device when I want to see them. Occasionally, if that's just a few seconds after the file was created (e.g. take photo on phone and expect to see it on the computer) some connection glitch delays this. I can't rely on the interface to tell when this has happened.