Villain in this hand seems pretty solid. He is on two of the three 2/4 tables that I'm playing and has 200BB+ on both for whatever that's worth. We have no direct history and he hasn't done anything note worthy thus far. We've been at the table for like 20 mins.

How is my line up to the river and can I call?

PF is probably marginal/bad but there wasn't much isolation of limpers going on. Also, I have a suited ace! How can I fold that?

He bet the river pretty damn fast, say, under 3 seconds after I checked.

I completely disagree with anyone who doesn't think this was played well against a fairly unknown opponent. Folding the river against almost anyone at this level is abysmal; call.

I don't like half-potting it when the board pairs unless you do stuff like this a lot when you have 88xx here. It might be worth it as a mixing-it-up play, for metagame reasons more than anything, if you face these guys a lot and play these tables regularly.

SC, betting the river is very bad, given the play before. You will likely only get called by better hands, and will force out a LOT of folks here who'll bluff in these sort of games. IMO, you need to SERIOUSLY re-evaluate your river play if betting seems a good move here, that looks very NL-ish to me. I think the idea of "1/2 pot bet regardless what you have" on the river seems counter-intuitive to me - why not full pot? Or check? Being so inflexible makes no sense, other than to make your decisions less complex, whilst (IMO) losing money in spots like this when a check-call is clearly the best move against ANY holding opponent has.

Basically, I don't like any line other than the one played by GLR, with the very obvious call on river given no read on opponent.

I like a 1/2 pot bet on the turn in certain cases, especially when I have absolutely no showdown value and was betting the draw on the flop. Then I make a point of also making the same bet with a boat in such a spot.

Now the line Roy took seems fine but I don't think you can fold the river unless you know your opponent is never bluffing. Hands like busted wraps or combination hands like KK89 should make for 1/3 of his range, right? You have a bluff catcher so go ahead and catch.