Co-founder and editor, Ken Fisher:
It's the same review that you get for free on Ars. You don't have to pay for it, but people have: The ebook sold 3,000 copies in the first 24 hours.
You read that right--in just 24 hours, a review of a new operating system made $15,000.
Color me impressed, especially considering that relatively few people own Kindles (their loss), and that the Kindle version of the review is $5, which is the monthly cost of a ("premier") subscription to the site.