[ChrisV]

The problem with the idea of seeing a "free flop" is that you're going to be able to do the same stop-and-go calculation as you do for just about any flop (except highly coordinated ones).

I don't figure he has better than a random hand to decide to play, I think he has worse than a random hand. If he had a good hand he'd have raised allin. I think Qx rates to be a favourite here. I don't want to give him the option of check/folding a bad flop for him (e.g. three hearts).

I think checking is OK if you don't mind making tough calls e.g. on the flop that actually came down, but I'd rather put the money in preflop as I feel I'm ahead.