Rated 4 out of 5 stars
The best cross-platform, cross-browser, independently-accessible-from-internet-cafes password manager that I've ever found.
To be honest - it's a bit difficult to review this as an add-on. It's more of a service offered in the cloud, and the "add-on" is merely a means of accessing that service. It's possible to access the service without using the add-on.
My only qualm with it, is that it occasionally corrupts a few entries in my "vault" (as LastPass refer to it), at a frequency of one website every couple of months or so. This means that I have to maintain my keepass file in synch with LastPass just for backup purposes, which is a bit of a maintenance overhead.
Still, it's well worth using, because the time it saves in logging into websites when it does work, far outweighs the few minutes of maintenance required for managing the backups.