if i didn't live in a hole in the middle of nowhere then i would definately change it, i've never had any problems anyways with any one even attepting to use my internet. i use mac address filters, no one knows any of the mac addresses on my network and only about 5-6 people within a 10mi radius of me even know what a mac address is and even fewer know how to change it. but i do have my admin username/password changed, its harder to figure out my username/password combo than it is to break a WPA, WEP key. and the mac address filter also helps out (even tho i've never had anyone even connect to my network that isn't in my house already)