Judging by its description (CDN-like functionality?), it might also do a great service if it offered to dual-stack the sites that use it. Even if time before June 8th runs short, I am sure they would get some new customers because of this.

The anti-ddos functionality is indeed pretty cool. I guess the reliable detection of "anomaly" vs. "spike in traffic" is the secret sauce - but if not, would be entertaining to know more about that.