In terms of looks, the Cordless Desktop Wave Pro is a very attractive set, sporting a stylish combination of silvers, greys and matte/glossy blacks. The MX1100 mouse is ergonomically shaped to accommodate right-handers only -- the Cordless Desktop Wave (without the 'Pro') has the same keyboard but comes with a cheaper, ambidextrous mouse.
Being shaped for one hand only does mean the MX1100 is very comfortable, though. On the left is a large thumb-rest coated with soft-touch rubber, while the right side has similar support for the ring and pinky fingers. Overall, the curvaceous contours of the mouse places all your digits comfortably and easily where they need to be. Likewise the wheel and buttons are all very easy to reach, with the one exception being the forward thumb button, which can be difficult to press without inadvertently pressing the back one.
As with all Logitech mice I've ever tried, button feedback is excellent. The four-way micro-gear 'freewheel' scroll wheel also makes a welcome return, meaning you can scroll through the longest document with just a flick of the finger. You can switch between this and notched scrolling (for games) with a button conveniently located just below the wheel -- unlike the G9, where you had to turn the peripheral upside-down to get at it.
Speaking of the G9, I also prefer the MX1100's implementation of DPI switching. That's right, for perhaps the first time in a non-gaming mouse Logitech has provided hardware sensitivity adjustment. A two-way rocker just to the right of your index finger chooses between two presets which you can set between 400 to 1600 DPI. All of this combined with the lag-free 2.4GHz wireless connection makes the MX1100 more suitable than most wireless bundled mice for gaming, but the DPI switching is handy for work as well as play.