Have you experienced the Comcast flip-flop?

I'm talking about the DNS hinky jinky that Comcast offers up when a website changes its server (and thus its DNS settings). We experienced that all day Friday: We see the old site; we see the new site; we see the old site; we see the new site; old site; new site; old site; new site; old; new; old; new....

...all via the same ISP: Comcast. From no other ISP have I ever seen the DNS confusion Comcast's plethora of DNS servers have offered up with each and every site migration we've overseen. Even perennial loser Qwest did better with its DSL service, where its DNS updates may have been slow, but once they happened, they happened across their system, with none of this confusing flip-flopping Comcast offers up.

Our sysadmin tells me this is just the way it is because Comcast has so many nameservers scattered all over. It just seems rather ridiculous to me. Sure, fixing how the internet works is something pretty much beyond any single company, and DNS propagation on a global scale really does involve a lot of data going out to a lot of nameservers. But really, synchronizing between computers should not be so difficult, especially among those owned and operated by the same company. I suppose there's just not enough demand for smooth and rapid DNS propagation for Comcast to rectify this problem in their rather large corner of the ethernet.

/rant