KeyCDN is rather spectacular. I’ve used them for more than two years now, and their features-for-price are unmatched. Of greatest importance to me, they support custom SSL certificates as part of their basic offering. Given my obsession with HSTS and HPKP (see also), this was essential.
In the last six months, they’ve spared my VPS appreciable traffic:
I can’t recommend KeyCDN enough. I’m told that Brotli and IPv6 support are coming in the first quarter of 2017. 🎉