
Logitech G
G600 MMO Gaming Mouse
Customizable MMO workhorse, durable, but discontinued and pricey.

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EVGA X15, is an MMO mouse but is hella ergonomic and for me has been well
No recommendations from me, just a warning. Stay away from the evga x15. On paper it seems perfect but this damn thing keeps forgetting the key bindings I set.
I have an anti recommendation. Do not buy the evga x15 mmo mouse. This thing forgets it's settings every time I turn off the computer. Button layout is nice though.
Hopefully their mmo mouse is a banger. I've tried the nagas, aerox 9, evga x15 and most mmo mice over the years, but there hasn't been much innovation in the mmo mice department, especially in terms of reducing weight while keeping similar form factors / button counts :(
EVGA x15 is cheap and performs well as a MMO mouse. I actually bought a second one when I found them on sale for $19.99 over the holidays.
peak (swiftpoint z2) mentioned! other than this, i also own steelseries rival 500, EVGA x15 (and while its mainstream, cant forget the og Logitech g502). Runner up that id love to own is the godawful abomination Elecom M-dux70bk. Theres also a really nice DIY open source mouse, called lynxware im primarily an mmo mouse enjoyer so weights and size doesnt matter to me
EVGA X15 - 8k poll rate, pixart 3389 sensor, optical switches and a third finger shift button for even more input options. Major bonus with EVGA is that everything is stored in the mouse, configure it on one PC and use it anywhere. I also like the shift button a lot more than the logitech g600's, I don't find myself accidentally clicking the X15's shift. Early versions of the X15 have a variety of issues that made the mouse a loser for a while. The latest one I got from them has been solid for some time now. Only way I know how to tell the newer version so far is that when plugged in it starts with a default profile that you have to change out of. Earlier versions of the mouse I had didn't do this. However, I wouldn't know if this was changed in a further updated version. The specs and the onboard memory of everything is what kept me with this mouse through the early issues. With my main desktop being Linux, relying on software was a no-go for me. With the current mouse not having any of the problems that the prior versions have, I feel pretty good about suggesting it now.

Logitech G
G600 MMO Gaming Mouse
Customizable MMO workhorse, durable, but discontinued and pricey.

VXE
R1 Series
Budget king: lightweight, great value, long battery life.

Hitscan
Hyperlight
Ultra-light (39g) for small hands; sensor is outdated.

Razer
Viper V3 Pro
Adaptable shape, optical clicks, but scroll wheel malfunctions.

Logitech G
G502 HERO High Performance Gaming Mouse
Durable, heavy workhorse with free-spin scroll; prone to double-clicking.

Ranked #1
Hitscan - Hyperlight

Ranked #1
Teevolution - Terra

Ranked #1
Razer - Viper Ultimate

Ranked #1
ROCCAT (Turtle Beach) - Kone Pro

Ranked #1
Logitech G - G600 MMO Gaming Mouse

Ranked #1
Razer - Naga Trinity