The unit will pay for itself within a year for the average
cross country flyer. At over a thousand dollars for the
EFlybook, how do you figure it pays for itself?

I spend $80 every quarter to purchase new charts and approach plates.

This must be "new math". $80/quarter=$320/year. The unit costs over a
thousand dollars, so it would take three to four years of this just to
pay for the unit, not counting the data subscription costs.

I looked at the unit at OSH (show price $899). I like the idea, but
given today's processing and storage capacity, the eflybook is
overpriced. Additionally, I would prefer a metal framed case. Aviation
is too rough on plastic cased products.