I was just going to say, in my opinion this gives you less control over the whole environment and you have to trust AeroFS to fix any bugs and add features when/if they are needed.

I guess on the plus-side, you get phone support, if that is what you need.

Owncloud is open-source and really quite powerful, I am surprised it was not mentioned more in these comments.

Yeah, don't see any real advantages over Owncloud.