I also read John Siracusa’s Mountain Lion review, in Instapaper, after having saved it through Safari.
If you go to the article there are a ton of options for reading it, and paying for it, however you prefer, like as an ePub or as a Kindle book. But if you use Instapaper you may not be so inclined to do that.
My justification, even if it’s flawed, is that I don’t go nuts over these reviews. I appreciate them, but I’ll skip entire sections that I’m not that interested in. If you’re one of these guys you may dissect the entire thing and get your money’s worth.