[chaz6]

I wanted to give Cloudflare a go, but I did not want to move my whole domain. Unfortunately you can only host a subdomain with a paid account.

[dizhn]

You only have to have them be your domain's name servers. Domains can stay at another registrar. This is pretty risk-free. They didn't even used to be a registrar until recently and they don't support registering all tlds so this always worked.