My domain has me plus the wife, and she’s not willing to tolerate any amount of fiddling or bugs or anything, so we needed something that would Just Work™, and Fastmail fits the bill quite well.
Their features are great, I actually prefer their app over the native iOS app, and they’ve been rock solid since I signed up. I can also have any amount of aliased and I can put all three of my domains on there. Plus they’re not Google which was the biggest thing I needed them to be.