A very good friend of mine was one of the test pilots on the project. The airplane died because management was basically out of control- had phenomenal projections for sales, wouldn't listen to actual problems on the aircraft that were being told to them by the test team, and so on. Typical of the situation where the chief designer is the boss of the company - no one could tell him his baby was (slightly) ugly.
Very expensive (at the time), had no differential braking, needed to shift weights from the tail boom to the nose when you changed passenger loads, doors popped open all the time, etc...
Pity it wasn't sorted out.