In terms of strategy, the first bosses are on par the with Prince, Nightbane, and Gruul. In terms of demands of the play, though, they're more around Mag or early SSC/TK. Long, extremely mana-intensive fights, and one little *****-up can easily mean a wipe. The time we got Bear and Eagle down on test, our DPS was pumping out between 800 and 900dps, and I was putting out about 225mp5 as a shadow priest and the healers and other casters were still having to pot in order to not go oom. Don't know if live is much different or not.