I got burned by AeroFS recently. Uninstalled AeroFS and then wiped one computer; when I woke another one up, all the data I had synced with the first computer started getting deleted, as indicated by many Growl notifications.
I could not stop the action and was only able to recover bits and pieces of data from deleted blocks. On OSX, one might think that deleted actions would move the file to the trash but, nope, straight up deleted. These two unexpected behaviors have convinced me drop AeroFS and stop telling others about it.
There's a good chance you won't ever see this response since the thread has aged off the front page, but I figured I'd respond to it anyway, just in case.
We've actually addressed this behavior in the beta release recently by introducing local revision history. Unfortunately we haven't exposed this through the UI yet, but if this happens again in the near future I'd be happy to help you recover.
I could not stop the action and was only able to recover bits and pieces of data from deleted blocks. On OSX, one might think that deleted actions would move the file to the trash but, nope, straight up deleted. These two unexpected behaviors have convinced me drop AeroFS and stop telling others about it.