Yeah his reviews are very good. I do feel it would be nice to have a bit of a comparison section at the end though, to discuss some of the more technical details within the operating system landscape. For example timer coalescing/race to sleep is something I know Windows 8 has and I assume Linux, and the App Nap sounds like a more advanced version of the Metro tombstoning, and I think Linux can do memory compression but Sprite Kit sounds rather unrivalled by first parties. I would love to have his views on it all.