Jason Cipriani, CNET:

Being able to control your tablet without touching the display brings the iPad closer to working as a laptop, and in turn, makes it easier to get more work done.

And:

However, not all trackpads or mice are created equal. There’s a big difference in overall experience when using Apple’s first Magic Trackpad or its newer Magic Trackpad 2, which we’ll cover more in-depth below.

Really nice collection of animations, very useful.