Challenged him today with a single group, all EP-geared or worse:
70 Necro
70 Necro
66 War
68 Clr
70 Druid
56 Druid
56 Druid and Cleric were dualboxed by the two Necros. We got him down to 2% in a little over 20 minutes, at which point we totally fubared the positioning and ended up aggroing the mobs back by orb and several more from god knows where. So, in theory we should have had him, but we got sloppy at the end.
I haven't swore that much in a long time, argh!