I got a credit card with them a few years back and immediately regretted it. Their tech (website, security, etc) seems okay at first glance, but almost immediately it turned into agony. Even just logging in is a chore, and often doesn't work. Their two-factor implementation is a mess.

In short order, I cut the card up. Still get sad emails (which they provide no way to stop) begging me to use it.

Also, interviewed at MongoDB once. Couldn't shake the feeling of a cult, where everyone was careful not to speak of the product's serious limitations.