You'll learn more than you ever knew about computer mice.
The G500 you bought has the Avago ADNS-9500 sensor. You may or may not have noticed, but this sensor suffers from inconsistent positive acceleration on all surfaces and negative acceleration on cloth surfaces.
Cyborg V7 is a keyboard, do you mean the RAT 7? They use the Philips Twin-Eye sensor which is capable of tracking on the Z-axis. This causes tracking issues with lifting the mouse and softer mousepads.
IMO, lasers sensors still aren't quite up to par yet. The Deathadder arguably has the best sensor on the market.