i've been a usaa member since i was 16 (thanks, daddy) and i couldn't agree more that they are fan-tabulous!!
i haven't had any loans with them, but i have a checking, savings, iras, money markets, credit card and insurance. i've only had about 2 bad expereriences with them and when i called right back, i spoke to someone who was able to fix it each time. you just have to assume that you will eventually come across someone that doesn't know something from time to time, but overall they are great with the customer service.
i also have navy fed, and while i have no major complaints, i have found them to be not quite as helpful as USAA. i've had a couple of minor issues lately but not enough to stop using them completely. its a secondary bank for me though, i'll use them out of convenience.