I decided to use Google Domains for a while as my domain name registrar. I had a domain expiring in two weeks so I transferred it. Google Domains is $3 cheaper than the registrar I’ve used for the last 15 years. It seems to have all the bells and whistles so we will see how it works out.
Some people have problems with anything Google, but I have never had any issues. I feel comfortable switching to Google Domains. The only thing I can see going wrong is that they might change the mind and stop offering the service. I’ve was burned when they stopped using the Google Reader and I had problems when they switched their image storage to Google+. I found workarounds easy enough, but there is always the chance that someone will make a decision that makes registering domains a problem.