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The castor is hands down the best option, maybe next to the zowie FK1. Here are some resources to educate yourselves on mice sensors, acceleration, angle snapping, prediction and other malfunctions that make an otherwise good mouse inferior:
http://www.overclock.net/t/1251156/an-overview-of-mouse-technology
A resource with most of the sensors and switches for popular mice models listed: https://docs.google.com/spreadsheets/d/1PasRoe9beFSsxgM3b-vasdbI6CEUD3P6iDCnMqW7sqM/pub?w=100&h=650
Lists of mice without any tracking issues: https://docs.google.com/spreadsheets/d/1ZzbKDmFOqsP_ut2RdctD01OEbZzbXol6HLwqVkSmZcg/edit#gid=0 http://www.esreality.com/index.php?a=post&id=2024663
Mouse benchmarking process insights: http://www.esreality.com/?a=post&id=1265679
More on the sensor technology: https://web.archive.org/web/20120911001616/http://www.overclock.net/t/854100/mouse-sensor-technology-guide-v2-0 https://web.archive.org/web/20120926023603/http://home.comcast.net/~richardlowens/OpticalMouse/
logitech g502 vs mionix castor vs mionix nous 7000
yousef_gamer2
0
The Logitech G502 uses the Pixart PWM-3366 sensor, the Castor and Naos 7000 have a PWM-3310 under the hood. The 3366 is nearly identical to the 3310, but slightly more raw (1:1 input) while the 3310 is more forgiving. This paired with the fact that the Mionix Castor is an ergonomic wonder that fits neatly in pretty much everyone's hands makes it the best choice, for 50$ it is a steal.
Dont run into the fallacy of bothering with RGB lighting, weights, swappable parts, ridiculous amounts of extra buttons et cetera. The mouse serves only one purpose - accurately and reliably tracking your hand movements and sending this data to your computer. Everything else is pretty much irrelevant.
Logitech is making some sexy mice. I purchased the G600 a while back and I love it. This G502 looks killer!