I find that Userman is a really good choice to build a hotspot service for a company, but i think, as user, that there is something missing, few things like embedded sms verification (and not the script), and the one that i found more interesting, make the userman database readable (just think about a company with a newsletter). All could be added to make userman like a serious radius server (chr would allows more performance for anought clients). more competitive !
Thats all 
Regards from an Italian user