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Nailing down a high-quality mouse sensor is tricky without getting hands-on time with a given mouse. The two key sensor types are "optical" and "laser" sensors, but you can't apply absolutes when judging them. Your best bet is to try out a mouse in person, or to rely on formal reviews like ours, as well as online forums, for the skinny on how a mouse feels in specific play situations. Less-expensive mice tend to have optical sensors, which offer good tracking sensitivity and tend to map well on a variety of surfaces, including textured ones such as cloth. Laser sensors, on the other hand, map onto the same or more kinds of surfaces (including some smooth or glossy ones that may give optical sensors fits), but they can be more finicky about rough surface textures. That said, we wouldn't let one kind or the other be the main reason you choose a mouse. Likewise, some vendors market branded versions of sensors that track, say, on glass or reflective surfaces. Do...