Steve, you betchya they have! One P18 and one P14 have gone to Hawaii. The P14 meant to circumnavigate, but he met a girl in Hawaii.
There are a couple websites full of great stories. Potter-yachters.org (if that address doesn't work, try an underscore) is one, and the West Wight Potter Owners Homeport is another.
There's a yellow P14 planning a trip around parts of the SF Delta with the rest of the club in a couple weeks, weather and cowardly skipper permitting.