Typical advertising, all "much better than..." and "twice as much as..." without any actual numbers. I went to their website, and it was much the same. No prices. My GUESS is about $1 per 10 W or $1K per 10 kW. Of course, the wind doesn't blow all the time. Those are "best case" outputs. Still, I might buy one if I could find out more about them; but they obviously have a good reason for NOT revealing too much....