"Installation was simple: we plugged the small USB dongle into an available port on our notebook and installed two AA batteries under the Ci95m's removable lid. For the most part, the mouse felt comfortable, although it was a bit too flat for our tastes: we would have liked a more rounded surface under our palm to make it more ergonomically pleasing. The Ci95m was sensitive enough moving around on our desktop, but those who prefer greater accuracy should look toward the Logitech V550 Nano or the Microsoft Explorer Mini Mouse instead. The plastic upper lid and spin wheel felt a little chintzy, and the wheel wasn't as responsive as the smoother one found on Logitech's V550 Nano.
At $39.99, the Ci95m is a decent mouse for the price, but for $20 more the Logitech V550 offers a better ergonomic design, a silky-smooth scroll wheel, and the ability to clip the mouse to your notebook for easy transport."