I like electric stuff because of the quiet and mechanical simplicity.. but two biggies come to mind.. one is the power .. the little plane was using 23 kilowatts more or less to run at cruise in its low power mode.. That is the equivalent of 230, 100 watt solar panels.. which is about 1476 square feet of panel.. and that might cost (at about $110/100watts) $25,300 !! might not be completely economical.. (yes you can store power in a battery and so don't need the full 23 kilowatts, but batteries are pretty expensive and usually the 100 watt panels are rated at their highest output, not on an average day) The battery cost for the plane is $22500. The second problem I have is that since electric motors have only a couple/three moving parts (ball bearings and rotor) which do not require much precision machining or assembly, why are the prices so high for something like an electric outboard ?
In all fairness, the little ship is designed as a trainer with a one hour endurance. It would be excellent at that design point, probably a good investment for a flight school .. but not so much as a real, cross country airplane..
I am not biased against electric powered vehicles, I don't think they are (yet) as versatile as the liquid fueled counterparts.