Cannot stress enough how happy I've been since moving all my domain names to Google. Also, sometimes I've had questions and their phone support has been spot on. Side note (my 2 cents): In the past, I was happy with using Hover.com and thought their support was top notch, Google blows them away.
FYI - when I tried Google Domains, I ran into a lot of issues with their naked domain forwarding (i.e. if someone goes to example.com/123, it would not forward to www.example.com/123). I don't know if that has since been fixed, but their customer service wasn't that helpful.
for a second I hoped I could register my .google domain...
I like a simple interface, selecting many TLDs is a bit tedious though, I think they can do better in the next iterations.