Your results may vary with safety glass, tinted glass, and other surface treatments and material combinations that find their way into a potential work surface. We can't claim to have tried every variety of glass out there. Mirrored surfaces are still too challenging for either mouse. The Logitech mouse also handled all of the surfaces the BlueTrack mouse pioneered, from carpet, to a pants leg, to high-gloss marble. In both cases, the Logitech mouse maintained its signal while the Microsoft mouse failed. We tested the Logitech Performance Mouse MX and Microsoft's BlueTrack-powered Explorer Mouse on a fully transparent glass table, and on another glass table with a frosted underside. The only solid surface it can't handle is glass. BlueTrack projects a wider, more intense beam of light than traditional laser mice.
Microsoft solved most of those issues with its BlueTrack sensor at the end of 2008. Irregular surfaces, like cloth, or shiny surfaces, like glass, mirrors, and even marble countertops and varnished wood can throw off the reading. While capable of much greater accuracy than the old IR sensor, the common mouse laser is limited in the kinds of surfaces on which it can track. Up until last year, the laser sensor had established itself as the mouse industry standard, even in high performance gaming mice.
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