Summary: Very nice mouse (tracking with the blue optics is much better then my old one) but there is a big problem (for me anyway). You can't scroll left or right with the middle scroll wheel. I use Excel a lot and this is crucial for me. Oh well.
Summary: I bought this to spice up my desk starting at my new office. It arrived in speedy time it was much smaller than I originally thought however I loved it. After about 3 weeks however the rollerball scroller stopped functioning properly, I am still using it though! Good for laptop use and travel size not really for everyday use though.