I considered it, and while not perfect decided to stay with Google. All the justification for having a custom domain has strong counter arguments, for example:

I considered it, and while not perfect decided to stay with Google. All the justification for having a custom domain has strong counter arguments, for example: Self hosting a server- I am too lazy for that and there are too many points of failure in the process and maintenance. Vendor lock- yes, you can move your address but your emails are still being held by the previous provider. It is possible to backup and restore to a new vendor, but it is cumbersome and again a big point of failure "it looks good"- yes it does, but I couldn't care less