Holders of the "original" Amtrak Guest Rewards credit card will remember that it was run by MBNA, which specialized in affinity credit cards. Never had a problem with MBNA.
Then Bank of America bought out MBNA, and the AGR credit card was briefly discontinued until a new bank, which turns out to be Chase, was selected to offer the AGR credit card. Good thing, because I won't do business with the current Bank of America.
Chase has been perfectly reasonable for me. They're not your hometown bank, but for a big national financial firm, you can get plenty worse.
I'm a bit surprised that the credit card requires no annual fee to this day. I have to imagine this is at AGR's request; most of the other travel affinity cards have one. Though I'd be open to a second AGR card that offers additional perks (Club access, bonus points, upgrade certs, more point transfer opportunities, etc.) in exchange for an annual fee. Since Chase would purchase these benefits from AGR, Amtrak could benefit if enough people are interested.