My previous notebook wireless mouse, the Pro Mini, was also Kensington and gave me many years service suffering inumerable hard knocks on many long haul trips. It still works but the articulated wireless dongle is no longer articulated having been yanked from the USB port by my wife during a recent trip to Spain. So before it finally gave up the ghost I decided to replace it and being very happy with all the Kensington products I own decided on the black Ci75m. That is a decision I certainly do not regret.
This is a superb notebook mouse - most definitely the best I have ever used. It's very well and attractively designed, seems very robust and the slim profile is just perfect for slipping into a pouch in my laptop bag. Before receiving it I had a slight concern that the flat profile would make it difficult or awkward to use but this is not the case. It fits well into the hand, the rubberised strip around the mouse body ensures good grip and it virtually floats over any surface. All 3 buttons have very positive actions, the vertical scrolling is smooth and fast and pointer movement precise with no noticeable lag at all. The internally stored mini USB connector and wire are an added bonus though personally I would only use this option if I ran out of juice and had no spare batteries.
I would recommend this mouse to anyone looking for a good looking, well specified, ultra compact, easy to use, value for money wireless mouse.