Boswell blends are definitely tasty - I have particularly enjoyed Private Stock, Paradise, and Christmas Cookie. If you have a chance to go, it's a really cool experience. They usually have some of their pipes on display, for sale, and they typically have hard to find tins in addition to their own blends.
If you end up in Chambersburg around breakfast or lunch time, check out the place called "The Historic Texas Lunch" -- it's a small, family-owned restaurant that I found to be particularly good.