With a small range of similar devices on the market and a fairly high cost, Logithech produces an unreliable and cheap-feeling thing. For a company like this, it's a disgrace. Other Logitech mice, with much more extensive use, have served me for years before button problems started. Of course, I revived the trackball by soldering the left key switch (Omron D2FC-F-7N came up), and fixed the ball seat so that it would not hang inside the case. But I'm unlikely to recommend this device to anyone or buy it again in case of a final breakdown.
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