Summary: This issue has been around for G700 users for years with no solution or fix (even though its rather simple) from Logitech. Very very often this mouse will make the "alt" key on your keyboard get stuck, disabling you from doing a lot of common tasks like typing or doing anything really. Awesome mouse but this bug makes it nearly impossible to use.
Excerpt: Mouse worked perfectly right out of the box, just plugged in the usb unified receiver, Windows 7 found it and installed drivers and all settings were correct. I downloaded Logitech Gaming Software version 8.50 to see what else was possible, but if you don't want to fool with additional software you can just let windows handle the drivers.
Summary: - Several buttons aren't actually registered as unique mouse buttons, which means that they cannot be used as anything more than keyboard button shortcuts in games. Not a huge deal, but if you were planning on having additional keybindings, well, you can't, they just make your keyboard ones slightly more convenient.
Pros: - It Looked nice.
Cons: - Thumb pad buttons don't have actually switches in them. They're mushy cheap plastic, loose and completely unresponsive. You have to mash them down even after the depression for response and they won't stay held down and stutter. Mine had button failure warning signs right out of the box, and apparently that's not uncommon. Specifically - Thumbpad buttons G6 and G7 are unresponsive unless pressed in to the point of discomfort well past the register, apparently a comm...
Summary: Battery life lasts like a day max. Pretty useless having a wireless mouse when you have to keep it plugged in constantly. I guess you can unplug it for gaming sessions, but I'd honestly rather have a slightly worse mouse that lasts much longer. You can, however, replace the AA batteries that come with it. They seem to be standard Eneloops, which is nice. Also, the profiles constantly get reset for me.