Title: Great mouse but I still prefer the old MX510
Product review: I had the old MX510 (same shape as the G5 with the 800dpi red optical tracking instead of the 2000dpi laser) for years and resisted upgrading to the G5 due to the lack of a second thumb button. So when Logitech finally put the a second button on the G5, I bought one right away. Overall, the motion does feel a bit smoother however I find that the middle mouse button (the scroll wheel button) is too imprecise and I can't always activate it without accidentally scrolling the wheel, this never happened on the MX510. The sensitivity adjustment is pretty innovative however the sensitivity buttons are a bit awkwardly placed. I would have preferred if it was more like the MX510 with one button in front and one button behind the scroll wheel instead of having both buttons placed behind.So while I do like the mouse, it would have been perfect if they just put the laser tracking engine and sensitivity adjustments into the MX510 body.
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