Re: Who uses UPnP?
Try having a household with 5 active users each with several devices connected, then TV, DVD, 3G phone signal booster, VOIP with several handsets...all without UPnP. I'd never do anything but frig around with port forwarding, not only that, but for example if you use Skype or a VOIP provider on multiple devices my very decent router (Fritz) nevertheless does not allow more than one port-forwarding rule per application since it binds that application to a specific named device - that's nice and secure but very limited in my situation.
I try and counter risks by ensuring that I use a good security suite at least on the PC/laptops which block unknown traffic, in or out. Not sure what I can do with smartphones and other devices though in terms of firewalling.