Most recently the Viper Mini: After less than two years the main button clicks became spongier and spongier until they started erroneously reporting double-clicks. The razer utility is also a piece of junk! The logitech mouse I had between these two Razers lasted nearly 10 years and was only replaced due to cosmetic wear.
I got a higher-end logitech mouse this time and they now have this 'esports configurator' which lets you set up your keybinds, sensitivity, LEDs etc, and save it to the onboard memory - no need for an always-on utility app and your settings persist on different devices!
Remember what Logitech have at the time? Huge, heavy, imprecise dual sensor crap
I was just saying they used to be very good at getting great mice in the hands of gamers when no one else would.
It doesn't look very nice though, I'll concede...