Concur with Boston. Also, briar is a natural material, so it's not unlikely or bizarre that portions of the same root happen to be different in quality/grade. I too leave it to the manufacturers and, since I don't buy from carvers, I use price as a guide: I reckon that inside of the $80-$120 range (which is what I feel comfortable paying for a pipe) I'm bound to get a decent if not superb smoker. I don't agonise over it.