The shape of the Wedge seems incredibly nonergonomic at first, but it makes sense once you use it. The thick end stays at the rear, while your fingers grip the metal sides. When holding it, my hand automatically assumed the position it would be in holding a regular mouse; the Wedge Touch just eliminates the extra bulk. My hand made a lot of surface contact with my desk, almost as much as the mouse itself. This could be completely uncomfortable for some people, and I have no idea what long-term use of such a small and strangely designed mouse would feel like, but I found it easy to adjust to.
The design's charming and very small: one side door pops open easily to accommodate a single AA battery that powers the mouse. Pairing is as easy as a simple button press underneath.
The Wedge Touch Mouse is an elegant, well-designed ultraportable mouse, but it's not revolutionary. It's meant to add traditional input to a hybrid device like a Windows 8 tablet, not offer any advanced touch-pad functions. I've often wished that the iPad had mouse connectivity to go with a keyboard; add a keyboard like Microsoft's , and you'll have a pretty (and pricey) portable desk set.
Yes, pricey: the Wedge Touch costs $70, and that's a lot to pay for a tiny mouse. I expected a price closer to $40. Other mice are out there that offer similar functionality, and cost a lot less. They're not all as attractive as the Wedge Touch. If you have money to burn and want an ultraportable mouse at any cost, the Wedge is a pretty pick. I just can't personally justify the expense.