372 is the number I heard for joining. I took my hunter there solo yesterday and it is pretty simple, I'm planning on dual-boxing it as soon as I have other alts with the necessary ilvl as there's nothing in the first 4 bosses at least that would be difficult on multiple toons (no spreading out or needing to split to different locations, etc).

There were a couple of mechanics that caught me by surprise (first boss we did I hadn't read up on so didn't stack when I was meant to and second I'd read the dungeon journal but didn't expect the ice to move how it did), there's quite a lot of people who fail, but probably a good idea to watch a vid or run it solo just so you don't take out 20% of the raid in one go by not knowing the tactics.

Would be interesting to see a full group of multi-boxers try this, but I have no idea if you can queue for LFR with a full group.