[soah]

A free card is very unlikely to hurt you here. You'd love for KQ to catch its gutshot on the turn. The only other gutshots are KT and QT which are each unlikely in a raised pot (plus you hold one of the tens). The ace and jack of spades are each on the board, which eliminates many of the potential flush draws.

If you check here you may gain a lot of information about your opponents' hands. If there is heavy action you can fold. If everyone checks, you can lead at the turn and possibly get some action from a jack or from KK/QQ. By leading the flop you have basically reduced your hand to 32o, as you have no intention of making it to showdown (this is not entirely true, as someone may call your flop bet and then check behind on the turn and river with something you can beat).

I believe there is quite a bit of merit to checking and calling a reasonable bet on the flop, and then seeing what happens on the turn... especially against tight, rational opponents. They will have a hard time firing again on the turn if they do not have AK/AQ/AJ/JJ. Obviously though you only want to take this line if you have a very good read on your opponents, as it would be a disaster to end up folding the best hand on the turn. (An aggressive opponent may put you on a flush draw and decide to bet the turn with just KK or something, and that would suck.)

By leading the flop you take away all opportunity to extract any money from anything you beat (unless a flush draw chases... which is actually rather unpleasant for you, since that flush draw may decide to bluff you out of the pot if you completely shut down after the flop). Checking greatly increases the chances that you will get some money in the pot the times that you do hold the best hand.

This all assumes that you can play well postflop against these opponents. If this is not the case, then I think you should fold to the preflop raise, as you already know that you will be out of position with a hand that is generally going to flop a marginal made hand, or a draw.

All that said though, leading the flop is certainly not a bad play. Leading into the PFR may seem a bit suspicious, but you're showing enough strength that it will be difficult for anyone to try to put a move on you. It would be a rather poor play for anyone to risk their stack to find out if you really have an ace. But I think checking is a valid move as well in many cases, either because you know your opponents won't bluff (and you can get away from the hand) or because they are too aggressive and you can try to pick off a bluff.