The Logitech G600 MMO mouse has two right side mouse buttons (20 programmable buttons in all). Logitech no longer makes this mouse, and it doesn’t look as if they’re going to rejoin the mmo competition.
The only reason I still use the Logitech G600, is because of the extra right side button. This one button completely changed my games.
I use index for left mouse button, middle for the first right mouse button, and ring finger for the extra right side button. For MMO’s I keybind ctrl to the extra side button, which allows me to almost double my keybinds. In shooter games, I use it for dpi-shift. Holding down the button I can switch mouse speed to quickly turn toward a target, then release it for easier aiming at the lower mouse speed. For voice chat, I can keybind it to alt, so I don’t have to awkwardly reach for alt button to talk. It is extremely convenient, and, in my opinion, a must. I have been using this mouse for 10+ years, and will use it until it dies, or some other company creates one similar.
The reason I am writing this here is, I would love if Razer would create a mouse with the extra right button, similar to the G600. There are many of us who have been looking for a company that does. There isn’t another mouse like the G600 anywhere, many of us have looked, and are still looking, hoping that someone will make one. I believe such a mouse would be in high demand, once people realized the utility and convenience of one extra right side button. It really makes a huge difference.