+1 on the Danish bits. They are decently well-made acrylic and they improve the feel of the pipe from "cheap toy" to "real pipe." I smoke a lot of cobs and my favorite combination is the "Washington" cob with a Danish bit. The Washingtons only come with the cheapo plastic bits, so you have to buy the Danish bits separately for about a buck a piece.Except for the tiny ones, I like 'em all. If I had to pick one favorite, it would definitely be the Mark Twain. Buy a Twain, a couple of the Danish bits, and you really got yourself a smokin' machine.