Well, I recall 30 years ago, if I wanted an off the shelf solar panel from radio shack, it consisted of a bubble lens array, and under 10% coverage of actual junction material on the module providing a couple watts. They used those on their solar calculators too, so this wasn't a matter of it being a hobby class product. Today, every panel you can buy is probably about 80% coverage and the efficiency from multilayer films is much better so it's probably at least 2 orders of magnitude more efficient today by area, mass or cost performance. And they were freakishly expensive back then. So an order of magnitude for 20 years doesn't seem unreasonable.
Milliwatts, my mistake.
Their idea of an offer you can't refuse is an offer... and you'd better not refuse.