The update scanning works quickly and efficiently. The UI has some unexpected behavior in my opinion, but that's already being tracked in the bug tracker for the extension.

Does not work in URL: http://www.nirsoft.net/utils/netresview.html

Needs faster refresh rate.
I use it for internal resources and 5 minutes is way too long sometimes. I would like the minimum to be at least 1 minute, 30 seconds even better.