I tested it last night in SM. I was averaging over 10k exp per hour grinding in the GY. Not too bad for a 5 box crew, about 4 - 5 hours per level assuming no quests.

It worked markedly better over the standard hellfire setup (with no talents). I only lost a lock a few times but no wipes, even with some rather massive pulls of 12+ mobs (non elite ghosts).