Pros: Fits into a very nice space and adds a trackpad so you don't need a mouse. I've found this very useful in my lab where I have the monitor raised on a shelf and not enough space for a regular keyboard and mouse. The trackpad works well.
Cons: I find that I frequently have to slow down typing on this little guy because it doesn't register all my keyclicks if I type too fast. That can get pretty frustrating!