Rough math says about 11k for me on Jin'Rohk, ilvl 503, hit/exp capped & 13% haste (27k DPS taken - normally around 110k AP). Under the same conditions it would also account for about 2.3k HPS (1.5 SoI, 0.8 Battle Healer). With the balance of physical vs. magic boss damage, the uptime of the proc, the incoming damage & the overhealing from SoI I think the defensive benefits of the dps gem pull ahead for normal mode, not to mention it looks much more reliable.
9-12% increase to single target seems about right.
10 minute test on target dummy with 16,2k haste says it's 7.7% of my damage. 7 lightning bolts per minute.
considering it scales with AP i'm very excited to take this puppy out for some high-vengeance action.
P.S.: Confirmed in tonights raid. The proc is pretty much exactly 10% of my dps (plus crit rating).
Last edited by mmocc23bbb0a5f; 2013-04-11 at 11:45 PM.