When comparing Logitech G400s vs Logitech MX518, the Slant community recommends Logitech MX518 for most people. In the question“What is the best gaming mouse?” Logitech MX518 is ranked 11th while Logitech G400s is ranked 32nd. The most important reason people chose Logitech MX518 is:
There is a built in application switching button that behaves the same as alt+tab.
Specs
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Pros
Pro Flawless sensor
The G400s uses an Avago ADNS S3095 sensor, which does not have any kind of prediction or acceleration issues.
Pro Application switching button
There is a built in application switching button that behaves the same as alt+tab.
Pro On the fly sensitivity switching
There are two buttons above and below the scroll wheel that allow for on the fly sensitivity switching.
Cons
Con Not competitive for its price range
While being an okay mouse the G400s does not have comparable features or specs to mice in the same price range.
Con Not produced anymore
Logitech MX518 is an old model, that has since been replaced by G400 in 2011, which in turn was replaced by G400s in 2013.