I've been using AeroFS in headless mode on my NAS as well, and it's worked fine so far (the headless mode itself, I think there were a few bugs in AeroFS).
I'll try it again now, however. If they nail the fundamentals down, it'll replace Dropbox for me.
EDIT: Or do you mean custom NAS OSes? Mine just runs Ubuntu.
I used to build my own SqueezeBox Server for years from source, but after a while I just wanted it reasonably up to date, in a stable build, without the hassle. I'd hope that AeroFS would be packaged in the same way so it's not another thing on my list of things to maintain.
I'll try it again now, however. If they nail the fundamentals down, it'll replace Dropbox for me.
EDIT: Or do you mean custom NAS OSes? Mine just runs Ubuntu.