Has anyone tried Webmin + Usermin in a production enviroment? Using it in development works well for me, I just wanted to know if anyone else out there might be using it for customer access and if it is user friendly enough to be installed across the board on my servers.

(sometimes it easier to get other opinions, experiences, and troubles, before taking the leap)

I've been using Webmin on a RAQ for a couple of months and have found it extremely useful.
The only module of usermin that I'm using for endusers is the cronjob control, as the RAQ comes with a reasonably good GUI anyway, plus I have Neomail for all sites...

They've just released yet another version of both Webmin and Usermin, so there are probably even more functions available