I've been using a Razer Naga Epic for 5 years. I'm on my 2nd one. It works well for me, but there are a few downsides that others may not appreciate. - Softwar

I've been using a Razer Naga Epic for 5 years. I'm on my 2nd one. It works well for me, but there are a few downsides that others may not appreciate. - Software can be required to run, needs admin to install. Sometimes the mouse can "remember" its key mappings, but often it resets to default on new PCs (1234567890-=). - Internet sign-in required, cloud storage of mouse config is required. But there is an "offline" mode, so you could install the software to a single workstation and just save the profile locally. - Mouse is not cheap and some people don't like the company.