At first site, this extension looks Spartan but it is much better under the hood than many other similar deterministic password managers. Once you learned its inner workings, you get the feeling of a strong product. As far as I know, all functions work as described without a glitch.
The autofill function is one of the best I have seen.
A feature that is uncommon with this kind of password manager is the capability to save a note and/or a specific password for each website login, this way it is easier to make the transition from a vault password manager to deterministic password manager like this one.