how feature complete / usable is this?

[0xgeert]

Seems pretty dormant. Are you using it yourself?

Looks exactly what I need, but ensure if I should take this (and possibly extend it) or roll my own.

[nkohari]

It's definitely dormant. It worked well for what I needed it for, but it's never seen real battle. :) If you have ideas on how to extend it, feel free to send some pull requests my way.