This thread has drifted from Dunhills to the the subject of blasted and that's ok.
I my case I only own 2 smooth briars I can think of. The rest are blasted or textured like the Searock finish. Unlike many pipe guys I like the textured finish better than smooth for a few reasons. They are cooler on the hand when smoking, they grip better in your hand so you don't drop them as easily and finally I'm not paying for something (fine grain) that doesn't make the pipe smoke any better. Finally, and this is just a personal thing, as they age smooth pipes simply look older whereas textured pipes just get more character. I love my old, dull, black Searocks and wouldn't dream of polishing them up. They're great just the way they are.