I guess the biggest (and only?) drawback is that it (presumably) requires a Cloudflare account to use. So if you're living in Iran, Syria, Lebanon (and some more) you're out of luck as you cannot have an account with Cloudflare then.
It doesn't appear to require an account. I just gave it a try, installed the deb, typed that one line command and it just worked. No idea if it would work in those countries though, I only tried it in a US location.
Otherwise it looks like a nice offering for sure.