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Good stuff in this post, good info. And just to add to the knowledge pool, here’s my input. I’m pushin 40yo, been playin competitive fps/arena style shooter games since UT99 and UT2k4 TDM and CTF with clan Curse «c». I’ve also always had an unhealthy obsession for mouse hardware and settings etc as they relate to this type of discussion. I earned my nickname zeus for my skill with UT2K4’s Lightning Rifle. A few things I’ve learned over the years.
Cross-hair placement.
(For Dirty Bomb, my mouse setup as follows-
G303 mouse, windows mouse sens 6/12. Windows 7, 400dpi/1k hz polling. In game sens= 4ish. Also, google “MarkC mouse fix”)
Adjust video settings till you achieve a steady 70-90fps, ATLEAST… at all times. If you can’t…time to upgrade.
laser sensors are bad. no exceptions.
optical sensors are better. no exceptions.
not all optical sensors are the same.
400dpi= best feel. for me and others.
more than 1k dpi= absolutely no point…in THIS context.
80-85fov feels best to me.
Cross-hair placement, cross-hair placement…cross-hair placement.
I find the most advantage from arm aiming, rather than wrist aiming. IE- lock your wrist, use entire arm movements for most of your aiming, then fine tune/aim using ONLY your fingers/hand, keeping wrist locked 95% of the time.
Cross-hair placement.
Get the biggest mouse pad you can fit on your desk…then make an effort to use as much of it as possible for mouse space. I found a 36"x18" (914mmx455mm) cloth mouse pad on amazon for somethin like $20. Made by a company called Perixx. Big steel series xxl pad to the left. Keyboard (corsair k70) sits half on perixx pad, half on steel series. The rest of the big pad for mouse surface.
I’ve owned every high end mouse from every well known gaming mouse manufacturer that has ever released a mouse. Minus a few of the Kone offerings. My favorite company= Logitech. Favorite mouse ever- MX518/G400s, and currently tied with the G303.
Cross-hair placement.
The downside to my play-style is that I cannot keep up with high sensitivity smg/shotgun/AR players up-close/super short range. I just cannot move my arm fast enough, and most sniper sidearms are pretty weak if you miss the first shot with the sniper. I’m one of the stubborn assholes that ONLY plays the sniper char in shooter games, so take my experiences with a grain of salt. 
ohhh…
Cross-hair placement. gigglesnort[/left]