[Nick C]

When MP3 bets into the preflop 3-bettor, I think that's usually going to be an overpair. My guess (given that he folded later) is that this time it was overs plus a flush draw instead. Sometimes it'll just be overs, but I wouldn't expect that as often.

I don't know what the hell Button had. But now that there's only one preflop raiser left in the hand with you, I guess you might as well checkraise. You're probably behind (and you are only approximately a coin flip versus overs and a flush draw), but you'd like to get it heads-up if you happen to be currently ahead.

The rest of the hand looks good.

I think the preflop call is all right. Four other players are in, and since you're the BB you can enter the pot at a discount. Just keep in mind that there's a good chance you'll need to flop a set to win.

When there's a non-steal raise and a 3-bet before the action gets to me and I'm not in the BB, what I usually do is fold JJ and worse.