David, how can you say "this is not accurate" when the article simply says that OpenDNS (which I use and am a big advocate of) *may* not return good results, demonstrates circumstances where this is clearly the case and publishes code where people can reproduce the results themselves? I only wish more articles would do such things and be as accurate.
It's generally true that these are "edge" conditions but the internet is one giant collection of edges once you get outside the USA and a few major countries. I reside in Bangkok presently, travel around SE Asia a good bit and have found circumstances where using OpenDNS make it impossible to get facebook or google mail working. The local DNS servers are often quite unreliable so a service like OpenDNS is a godsend when it works but, having an awareness of the potential problems as noted in the article has saved me hours of headaches when things get pathological on me.
I'm glad to hear you're getting POPs in Asia - where the majority of internet users reside and is one heckuva huge "edge". I think it also shows to need for improvements to the protocols which can take a lot of time. I continue to use OpenDNS but now as a backup rather than a primary in locations where latency is increased as a result. Believe me I'm grateful to have it.
I think you owe the author an apology though. He's trying to be fair and accurate as to the potential issues with services like OpenDNS, help people be aware that they are not a panacea, and explan why. I think that's a good thing that should be commended.
-- Ben Scherrey