Apparently a pleasant craft to fly! Considering its unique qualities, it's puzzling that it didn't lead to any production versions, as is. It sounds like they tinkered with it for decades, until the DoD proposed a larger craft of similar layout, which eventually became the V-22 Osprey. The latter's development issues are legion - dangerous even with the benefit of modern fly-by-wire & avionics (which the XV-15 obviously lacked). Too bad they couldn't have just scaled up this original version, rather than inviting headaches by continually pushing the envelope of the not-yet-gelled technology.
If they were to seriously mass-produce military and civilian aircraft under these conditions, the current Osprey would have been produced in the correct form.
