At some point, you need to start doing calculations - what temp am I cruising
in, how much battery can I support, what is my charge rate, how often
will I charge, etc. Then decide if the extra efficiency is something you
need. If you need extra efficiency, then it is expensive.
For the type of cruising we do in Maryland, a unit like this doesn't make
sense. But, if I was cruising on a sailboat in the tropics, and let's say
I was a diabetic so maintaining insulin was very important, then high
quality and efficiency might be something I would pay for.
Mike