Had a memorable flight with Lanny Wadkins years ago, where he described playing Riviera shot by shot. I specifically recall his delight (when playing well) of using what he described as a speed slot on the 5th, but only when playing well.
I have found or built a few, but if Lanny, at one time a top golfer, would only aim for it when HE was at the top of his game, I have wondered ever since whether it was worth trying to build one for every day play. According to the slope system, only 2/3 of average players hit just 32 yards wide fw. Not that the reward has to be that broad, maybe as low as 10% chance might be even better.
For those who know it, the 15th at the Quarry was planned as a really dramatic speed slot, but out in the field, we started to wonder how we could ever get grass established on that steep a slope and turned it into a forced layup shot.