I prefer larger pipes, because I usually smoke once or twice a day and I want to enjoy it. I have a Joura in a Group 6 size, and three Barling EXEXELs with two of them being Group 6 size (one with a chamber diameter over an inch) and the other being about a Group 5.
This is the Barling with the monster chamber, at over seven inches long:
This is the Barling with the monster chamber, at over seven inches long: