Simple was super, super good about the whole thing. They gave me an interest-free loan for the whole amount and told me that if the dispute was successful (which it was), I'd just get to keep the loan. They also put an ACH block[2] on my account, and generally were super responsive in support.
Simple wasn't great for a lot of stuff you could expect from normal banks, like writing checks (for a while, you couldn't get a checkbook from them), cashier's checks, and money orders, but for everything else, they worked really well. I'm kinda sad to see them go.
[1]: I now know this is a bad idea. Always use a 3rd party or pay manually! [2]: ACH blocks are weak, but they're the only sort of protection against malicious actors like this. They prevent a specific amount of money from being withdrawn from a specific party, but there's no way to, say, block all withdrawal attempts from a party.