I migrated to iCloud in Feb 2022. It was a bit tedious to change the email address to all services, for some I had to create a new account since changing email address was not possible. I like how iCloud mail has worked, I use the web interface on my work laptop and Mail apps on iPhone and Mac, I haven't faced any issues with it.
I created one Lemmy account first, then a week later I discovered Kbin. Since there are currently some federation issues, I'm checking in on both accounts.