I was looking for something like OMM for my G604s. I refuse to install G-Hub.The G604 often goes below that price too. I like all the buttons and use it as my daily driver. The Logitech OMM tool is also good and much better than their bloated G-Hub app.
You just need to install once to flash your preferred setting on the mouse onboard memory and then uninstall the software.I was looking for something like OMM for my G604s. I refuse to install G-Hub.