Summary: After 4 months I started to get the issue where holding down left click would cause the "flimmer" effect which caused major issues with drawing, dragging icons or gaming (imagine drawing a bow, for example). I got it exchanged for a new one only to get the same issue even earlier on. At this point I just reprogrammed the thumb button to serve as left click and lived with it just because it would've felt silly to throw such an expensive mouse away.
Summary: This review is to get right to the point. I really like this mouse and it replaced my G9x that stopped working however I can't deal with the fact that the mouse emits a very high pitched noise that gives me a headache after about an hour of use. I sought a replacement and results are the same. I can't recommend this mouse until this issue is fixed.
Summary: I've had four or five replacements of the (G500) and they all double click after a few months, the last one lasted 6months. I just hope the G500s is better or I'll never buy another. I have a 5yr old Microsoft mouse that works great... I have tons of other Logitech products that I've never had an issue with, just the mouse's always go out. I take that back the Logitech 3D pro switches are junk too...
Summary: I went from a MX510 to this and its meh. The older MX510/518 mice were far more ergonomic, this strains my wrist some. Also, I thought I was crazy about the high pitched noise but now that I see two other people are complaining about the same thing I know I'm not crazy. Its rather annoying but does go away when you move the mouse. Just bothersome and irritating noise. I have never had a mouse make a noise so I suspect its related to the laser.
Summary: This product can't even be considered because the sensor is at the wrong location on the bottom of the mouse. This causes movements of the cursor to not reflect expected behavior based on hand movements. No other logitech mouse has this issue, it is beyond me why they would ruin their high-end product with such a basic fault.
Summary: whilst it should be stated that I purchased this mouse for design software use (AutoCAD particularly), I've been struggling with it for 2 months and have now finally given up. the set up instructions with five levels of DPI is presumably great if you actually understand what functionality all this complexity provides you with but if you don't (and I certainly don't) then it's just infuriatingly pointless usual high logitech standard of finish etc.
Summary: I found this mouse very good for the first couple of months, did everything I wanted it to. After 2 months the material casing around the wire snagged at points and started putting kinks in the wire. 18 months down the line I've had to cut the casing 8 times (over the 18 months) to stop it riding up and kinking the wire. This seems to have now taken its toll on the cable as every time I move it the mouse connects or disconnects from pc so impossible to carry on using it.
Summary: Was very happy with this for a time but the left click began to give problems followed by the rest of the mouse, I'm replacing it with the new G500s which is meant to have improved durability. The low score is entirely based on the durability.