But while it all sounds convenient, syncing my history, tabs, and windows is about all I would allow it to do. I mean, there's a reason that saved passwords and cookies were written with local filesystem security-- they're not meant to be shared across different computers through a network. Sure, the Browser Sync extension encrypts your data, but I just don't want my history, cookies, and passwords stored on anyone else's systems. After all, encryption once thought to be "unbreakable" has been broken plenty of times before.
So I may use Google Browser Sync, but if I do I'm going to use it in a very limited fashion. The convenience of having my passwords and cookies synced is not worth the security risk of having them stored elsewhere on the 'Net.