It's interesting to hear not only from a guild that has been around for a while, but is just now coming into the spotlight. And it's also cool to hear what the GMs are doing for the guilds testing the new content on the PTR -- they've deathtouched trash a few times, and even spawned "flaskators," which are NPCs which will give out consumables and other raiding standbys.
They also tackle the debate of whether "world firsts" actually count on the PTRs. Vis Maior does agree that PTR kills don't necessarily count if they're just being tested, but a world first kill of a "final" version of a boss should count. Duncor and Cad don't press them on this, unfortunately, but I'd disagree -- the only way you know a boss is final is if it is on the live realms, so only live realms should count. Still, Vis Maior sound like a great bunch of people (they sound like they really love to raid, which is always good for a high-end guild), and what they've done so far on the PTRs is definitely impressive. Kudos to them, and nice job to WoW Radio on the interview.