In one of Hwang's books he states that, with the bare nut-flush draw, and low SPR (2 or less), the equities run such that it's correct to shove the flop with them as a matter of course (you can hit your flush, and you may also have fold equity).
With additional equity, like gutshot, another BDFD, things improve further.
But what about on the turn, with an SPR of 1 HU against the pre-flop raiser, and the board not locked down? Does it make sense to try to get someone off AA here, and have the 4-1 chance of hitting your draw? Or is this just spewy play?
