Happy name customer with .io domains that roll over properly. I've used most of the big guys as well (including The Network Solutions).
In the last 5-10 years the issues started growing. Finally, I hit a wall and transferred everything off their service.
I now get spam emails of them trying to trick me into switching my domains back. The vitriol their helpdesk people receive is about as shitty as I get. Maybe they don't deserve it in their role, but hopefully the angry emails will get them to find a better job asap.