Definitely fascinating and amazing. There are a few western versions, mostly recreational and smaller, up to 10 seat craft. There are also some unique challenges...taking off into the wind also means taking off into waves, a lot of pounding on the fuselage. They can't avoid weather, and have a very limited ability to climb above obstacles. The limited applications make design cost very high relative to production cost
The Lun was designed for five day missions most of which would presumably be in "boat" mode. You can see from the photographs that the hull is more strongly built than that of a seaplane, and more sea-kindly than that of a seaplane (deeper V, multiple chines, retractable hydro-step, winglets to reduce roll). It could apparently take off in 5m waves, or up to Beaufort 6-7, so far less weather limited than a seaplane.
Would be interested to have opinions from any MPA types as to how useful this capability would be.