Lately my arc of interest has veered toward the Junk rig, undoubtedly because of my exposure to it via Hasler et al. It's an interesting rig with many advantages for the cruising sailor. It is easy enough for the homebuilder to craft, inexpensive relative to many other rigs, is self tacking and easy to reef or drop in a hurry. Most resistance to this rig centers around the perception that it won't go to windward. Recent and not so recent experimentation by Arne Kverneland and Slieve McGalliard, among others, have improved this function using cambered panels and other variations. You'll find much discussion on these matters on the Yahoo Junkrig Group site and at the JRA. Roger Taylor has two jibs for Mingming, a very light multi purpose Genoa and an even smaller dinghy jib he can carry up to about Force 5. Roger reports that "they make a big difference with the wind anywhere forward of the beam" but cautions that with an unstayed mast you must be able to get them in quickly.
Many designers have used the rig for their designs including Thomas Colvin, Thomas MacNaughton and Bruce Roberts. Michael Kasten has an interesting discussion of the rig on his website.
I would love to hear from anyone who's had experience with this rig.