The concept is great and perhaps they got it right this time. The boat will require the generator to run quite a bit but still should be more efficient than conventional engines. The downside is two Diesel engines combined with a generator gives you 3 sources of electrical power and two propulsion options. The electric setup has multiple single point failure modes that could disable the boat. Parts could be another issue. Lose a controller board and getting a new one might not be easy. The Lagoon 420’s seemed to work well the first two years and then the systems started failing left and right. It will be 5 years before we have a true report card on the new system.
One other thing to consider. The Voyage boats are great sailing boats. Electrical regeneration slows the boat down quite a bit.