Review on Black Logitech G604 LIGHTSPEED Wireless Gaming Mouse - Up to 240 Hour Battery Life, Dual Wireless Modes, 15 Programmable Controls, Hyper-Fast Scroll Wheel by Stanislaw Kisiel ᠌

The software was just terrible, but it seems the manufacturer is improving it. The functions of the built-in and custom profiles are periodically intermixed. Mouse speed keeps changing. My DPI is set to the same on the desktop and in games, but the speed is constantly changing as in the built-in profile (ie, by the DPI change button). Those. the custom profile button function works immediately with DPI increase. It is very uncomfortable. But the software is getting very slow, but better.