I bought this mainly for the price, unsure it would actually work with my computer (I have seen some posts of discontinued drivers, lack of support for Windows 7...) - but I took the plunge and now I don't regret it!
Didn't even take the CD off the slipcase, just placed the batteries, fired it up, paired with my computer and... voilá! It worked straight out of the box, both mouse and remote features played nice with Fedora 16 and GNOME 3.2. I also tested the slideshow support on LibreOffice with success.
The optical trackball mouse actually works very well, it just takes some time to get used to it, and the transitions between mouse and remote are instantaneous and seamless - I'm pretty sure it will work fine when I'll need it during a presentation!