Ed Bott’s review provides an excellent detailed assessment of the preview version of Windows 8,

A deeper dive into Windows 8: can Microsoft’s big bet pay off?

QUOTE: There’s no question that this is a thoughtfully designed, thoroughly engineered release. If you had any doubts, just read through the Building Windows 8 blog, where Windows boss Steven Sinofsky and a parade of program managers have published one epic post after another explaining the history, evolution, and design philosophy that went into every new feature in Windows 8.  This deeper dive is divided into four parts:

Page 2: The misunderstood Start screen
No, it’s not the “Metro shell.” It’s a full-screen replacement for the familiar Start menu. Brilliant idea or a bridge too far?

Page 3: What’s next for the Windows desktop?
There are virtually no “immersive,” Metro style apps for the Windows Developer Preview, which means anyone testing this pre-release is going to spend time in an environment that looks an awful lot like Windows 7. So what’s new? And what can we expect to change?

Page 4: To touch or not to touch?
This is the one complaint I’ve heard above all others. Do people really want touchscreens? Will they use them? I share my personal experience with three touch-enabled form factors.

Page 5: Security and reliability – Yeah, I know. Microsoft claims every version of Windows is more secure than the previous one. Windows 8 is no exception, but it pushes some boundaries with new features that have already inspired controversy.