BigMuffinMan :
As basic as it gets: Optical is the most accurate. The "fusion" and "proteus" is just fancy names for an IR optical sensor. Always get an optical sensor, there is no point in laser sensors as they are inherently less accurate than optical sensors and they are more expensive. Laser mice are complete gimmicks just so they can put some absurd DPI number on the box to sell mice to stupid 12 year olds. I used 400 dpi for all my games, I don't need anything more. The g502 and g402 are both great mice (although I find them to be very uncomfortable and too heavy) but the g502 will outperform the g402 by a little bit. I use a microsoft WMO, the greatest mouse ever (in my opinion, of course) because the sensor still performs better than any other gaming mice today. But it only has 400 dpi no extra buttons, so not a good RTS, MOBA, or MMO mouse
I was reading on Tomshardware about the g402 and they are claiming (not fact yet) that it could be better than the g502 and is more geared for mmo's and fps.'
http://www.tomshardware.com/news/logitech-hyperion-fury-g402,27345.html
I was reading what Morgilroka sent me. It was eye popping and yeah, I thought laser was more precise as I have the Logitech G500s (laser)
So, I will get a optical mouse this time. I've always gotten a Logitech gaming mouse; they've never failed me. Are they still the best? I feel stupid, IR is optical or is it laser?
I saw:
http://www.amazon.com/dp/B00I9BMFW8?psc=1
The low price is scary.
I was looking into the Logitechs 402 and 502 mentioned in my original post but I hear a lot concerning Razer.
By the way, I do play, MMO's and some MMO FPS'