Inverted here for life.
I also use Mouse2 for moving forward!!
Inverted because I played games before FPS's were invented. I played a lot of Elite (joystick), Rick Dangerous(joystick), Scramble (joystick) blah blah so when Doom/Quake came along I used the joystick.
When peering over a ledge to shoot a bad guy on a lower floor, it felt more natural to tilt the joystick forward like I would tilt a joystick forward to pursue a pirate spaceship trying to escape me by diving.
At my first lan party I got royally owned by absolutely everyone, not because of the up/down thing but because it was way too slow to turn around. I was a submarine periscope and it was easy to circle-strafe and stay behind me. It still irks me now when I see people on Twitch using controllers and moving about like neckless robots. Anyway so I switched to a mouse and it clearly felt better inverted.
I think it might also be because I hadn't used windows very much. I used DOS and my PC was just for games so I never had that conflict where in order to navigate with the curser, you push a mouse forward for the curser to travel up the screen.
I can't see there being any benefit to switching.
A friend of mine back in the 90s introduced me to mouse controls and in particular +mlook on quake 1 and I was instantly sold on the circle-strafe. Incidentally he also used to mouse2 for +forward
