PenultimateHop: It's also just a best practice. By not using your ISP's DNS servers you are most likely making your own Internet experience worse, as content delivery networks like Akamai, Limelight, and Google all rely on DNS tricks to figure out where you are. Using an out of network DNS server most likely means you will get worse performance due to being sent to the wrong CDN platforms.
Yes sorry I should have included the issues around CDN in the gotcha's...
Thanks for that.
Paul
