A Demo-Lock boxer, rocked my kitties pretty good.
He had 160k health on the locks, so I would guess some conquest gear and the 10% stamina talent.
Not sure if he was gearing for straight STA or had resilience either.

http://www.dual-boxing.com/showthread.php?t=34240

The only time I got any of his locks down, was when he was drinking.
And I opened with Feral Charge - Ravage, and dropped one.
Then another as he started the spell cleave... which is rather nasty for the kitties.
Warlocks 4, Druids 0; best I did was 3 locks down; he didn't lose a single toon when he was ready for me.