Quote Originally Posted by Toadstool
I don't think this is a stack off, SB probably knows that Hero has an overpair here and probably expects him to stack off, thats without even factoring UTG into the equation who can't fold an overpair. This is almost never a bluff so KK is either crushed against a FH/3 of a kind or flipping against a flush draw...with FH/3 of a kind more likely - you don't have much equity against this range. The only benefit of stacking off here is that you are less likely to be bluffed in the future, looking at it it may even be a slowplayed AA as SB doesn't 3 bet much.
This was pretty much my line of thought as well. SB's line looks really strong, 3-betting both UTG and the PF raisers flop raise.

Given that I was SB in this hand, this pretty much comes down to what level I'm on with hero, and whether or not I believe he can fold. I just figured that more people would at least think about a fold with KK here, but seems like most are insta-stacking.

as an aside - even though I 3-bet less than most, I'd probably always 3-bet KK-AA, but JJ-QQ are flatted pre a fair amount.