Don't take what I said in a matter to dis the quality of the product you mentioned I would love for viable alternatives to be around, It would make Merc probably lower their prices.
But to feel comfortable I need more than engineering. Serenity with availability of parts is one thing.
But the most important for me is public perception for re-sale of boats equipped that way. Sitting an extra six month on a boat when you want to move it is also very expensive, and you have to count that in the equation.