I've moved all my banking (credit card, checking, savings) to Discover and I've had great experiences any time I had to call them - except they refuse to lower my APR despite great credit. Oh well, I don't carry a balance so it's just the principle of the thing. And for no annual fee, the cash back is quite nice, and it has extended warranty and purchase price protection too!

I'm not a shill, I promise. I just really like my Discover relationship.

As a student currently building credit, they've also been quite helpful with increasing my credit limit when requested or giving me useful feedback on what I should work on before I request another increase.