I have used the G604 for 6 years and the 6 side buttons are perfect for me - not too few, not too many, just right. Plus Bluetooth & Lightspeed to switch between devices.
I’ve printed it a replacement for its rubber cover, but now I need to look at cleaning/replacing the switches as they are starting to double click.
I bought the mouse for ~$68 on sale, the resale market for the mouse is nuts.
I’m aware of Ploopy.