Just switched to cloudflare after the seeing the announcement. It's actually cheaper too, for a .com its $12/year from Google and for cloudflare its only $9.15/year. Switching was painless, was already using cloudflare as the nameservers for the domain anyway.
Doesn't work well with Firefox mobile as the default browser on Android. I put the app on my home screen but if I switch to Firefox to look at some web page then go back to the "kbin" browser app it's just a blank screen and I have to kill the window then reopen kbin.