I spent a few hours yesterday doing a complete erase and install of my trusty G4 PowerBook and setting up Apple’s new operating system, OS X 10.5, code-named Leopard.

So far, it’s very cool, especially the Quick Look feature which lets you preview your files right from the Finder without having to open the application associated with it. But I wanted to post a link to this review by John Siracusa, who has extensively reviewed Apple’s previous releases and generally has, in my opinion, refreshingly objective (and obsessive) thoughts on user-friendliness and interface standards and his comments dig much deeper into the nuts and bolts of the update than the usual glossing over of the shiniest new features.

So if you’re thinking about upgrading, or even if you already have, give it a read.