OpenDNS may not be 'faster' in terms of the time taken for your lookup requests to reach them, and then reply (your ISP DNS servers are probably 'closer' in terms ping times etc) - however, the OpenDNS infrastructure has been designed so you will always be querying the nearest OpenDNS server(s), and more over, they use multiple load balanced DNS servers, meaning the chances of the answers to your lookup requests being dropped or delayed is extremely remote (they just keep adding more capacity as the demand increases). The result of this is - very few (if any) outages, and a consistently stable (low standard deviation) lookup times to requests.
In terms of security, if you are on a static IP address, you can register an account, map your IP to it, and then configure their DNS servers to filter replies to your requests, to block malware and other sites. The downside of this is that some see this as a bit of a monopoly, as they have the power to block some sites that are perfectly OK (I've read reports of this happening). So people have mixed views on their service for this reason.
I use them, and I have no problem using them. They just work. In their most recent news letter, they quoted (as they always do) the number of DNS requests they are processing per day. That figure worked out at half a million DNS requests per second
(pretty impressive, right?). This will keep going up. There's no reason for a ceiling to be reached here. Because of this, there is no doubt that compared to most ISP DNS servers, they are truly in a league of their own when it comes to speed, platform design and security.
Edited by mixt (Wed 09-Nov-11 23:32:42)