Thanks for your reply Don
Surely the cuben tents would be taped and thus not need seam-sealing? If not, then I would expect the seams to be an extremely weak point in either tent design from what I understand of cuben/spinnaker. Maybe better to tape the seams, or is there a seam sealant that will give the seams adequate strength? I definitely look forward to your reviews...
John, there seem to be quite a few differences between the Refuge and the Lunar Duo. The Duo has more internal floor space, bigger (dual) vestibules, more head clearance, double entry and different vents for starters. If the Lunar Duo came in a cuben version I would be seriously tempted ;)