As has already been said, the letter graded pipes are purely aesthetics, the lowest grade winslow pipes are (to my understanding) essentially the same quality, as far as workmanship, geometry, etc. If straight grain is something you're willing to pay for then by all means, you should do so. But in the dark a Crown will smoke just as well. Personally I like pipes that are good smokers and pleasing to the eye/hand. For my personal tastes this is more about texture (rustication, sandblast) and interesting grain (birdseye, flame grain), I don't see the appeal of straight grain, but there must be something to it because I'm definitely in the minority on this particular count.