Originally Posted by mcrn
Is there any disadvantage to using this?
For 9 out of 10 people, absolutely no concerns. Don't overthink this but one 'negative' with using DNS setups like this (Google, Level 3, OpenDNS, etc) is you won't always get directed to closer web servers in cases where companies have duplicate servers located around the world. By that, I mean a website like Amazon doesn't have a single website server in the state of Washington, they have duplicated servers all over the country (and world). So when you use your ISP's DNS and visit amazon.com, you would normally get directed to their duplicate near Florida (hypothetically) or if it's busier, they could direct you to one a little farther away. With a public DNS, you might end up at an Amazon server in California or Michigan or Massachusetts or wherever. Will you notice any difference ? Can almost guarantee you that you will not.