I had one, purchased cheap on Amazon (~$35) but then returned. I found it to be decent, but the gestures didn't do much for me (on Windows 7) and the click action seemed a bit too hard to use all day. I just got an Apple Magic Trackpad, which is too similar but about twice the price, but I'm used to the Mac gestures already.
I don't mind touchpads, used them on the Apple Macbook Pro, various Dells and Lenovos (including the awful new version). They're usually a compromise but when designed well can be better than mice (again, not the awful new Lenovo ones).