The bottom of the Wedge Touch Mouse reveals the battery slider and power buttons, as well as the opening for the BlueTrack sensor. The sensor is powerful enough that you can use the Wedge Touch Mouse on almost any surface. Like, say, a reed place mat.
You can see here that the Sculpt Touch Mouse offers a mousing experience that's more substantial, and more traditional. The touch scroll wheel offers four-way scrolling, similar to that of Microsoft's old Arc Touch mouse.
I've always thought Microsoft's keyboards have a less-polished, plastic quality compared with Apple's or Logitech's sleek designs. The Wedge Mobile Keyboard actually feels substantial and easy to type on, but the rounded, mashed-together key layout still reads "cheap" to me.
Even if I don't love its looks, I had no objections to the feel of the Wedge Mobile Keyboard. The keys have a satisfying, responsive clickiness to them, and, most importantly, the keyboard is heavy enough that it doesn't move around while you're working.
Microsoft says it designed the Wedge Mobile Keyboard to physically match up with a tablet for convenient carrying. I suspect most people would probably put everything in a bag, but this setup would work well for moving around in an office day-to-day.
You don't get a transforming rubber case with the Sculpt Travel Keyboard, but it at least offers a larger typing surface. It also has Microsoft's familiar Comfort Curve design, a wavy ergonomic shape that makes the keyboard more comfortable to type on for extended periods.