PenFed are great. I've been a member for at least ten years, and I've been using their 5% cash-back card that whole time. I don't know if they still offer the card I use, but I get 5% back on gasoline, which is nice.
I've also used them when buying cars. I think our last two loans were 0.9% and 1.49%, both for used cars.
The couple of times I've had to call them over the years, their customer service department was excellent.