I've been a long-time fan of John Siracusa's incredibly detailed, honest reviews of Mac OS releases, and this one does not disappoint. To people complaining about paying for a review, understand that this is a short book worth of content critically describing the changes in the OS and their implications. Releasing the review as a Kindle book is an acknowledgment of that depth.
All that being said, after buying this Kindle version of the review, I am going back and reading it on the [...] website instead. The review was obviously formatted for the website, with movies, links, mouseover graphics, present and sized appropriately on the website. The translation to the Kindle version is awkward at best. The content is all there, except for the movies, but the formatting is honestly a mess. Page breaks split images from their discussion, or two related images from each other, and the sizing on the images seems somewhat random. There seem to be strange font size or spacing changes on many pages.
I'm happy to support Siracusa's work and Ars Technica with an inexpensive purchase like this, but in retrospect I think the money would have been better spent on a subscription to their website, which will also let you download versions of the review for offline reading, if desired. My review is 5 stars for the content, 3 stars for the Kindle delivery, averaged to 4 overall.