When comparing Logitech G400 vs Zowie FK1, the Slant community recommends Zowie FK1 for most people. In the question“What is the best gaming mouse?” Zowie FK1 is ranked 4th while Logitech G400 is ranked 5th. The most important reason people chose Zowie FK1 is:
The standard lift off distance on a cloth mouse pad is 1.5-1.8mm though it will be a bit higher when using a plastic pad being 2.2 - 2.4mm. To enable the plastic pad setting a certain button combination has to be pressed on the gaming mouse itself.
Specs
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Pros
Pro Great for palm grip
The Logitech G400 gaming mouse was clearly designed specifically for palm grip.
Pro Thumb-rest
There is a built in ergonomic thumb rest so users can rest there thumb instead of constantly gripping.
Pro Comfortable side button placement
The two side buttons are located in an easy to reach, unobtrusive position.
Pro A true successor to the legendary MX518
The Logitech G400 gaming mouse is based off of MX518. It has a few minor incremental improvements that don't change what made the original so great.
Pro Accurate 3600 CPI optical sensor
The mouse has an accurate Avago ADNS-3095 optical 3600 CPI sensor. No angle snapping, no acceleration, no prediction.
Pro Quick-access CPI shift
Above and below the scroll-wheel there are buttons that allow increasing and decreasing between 400 and 3600 CPI on the fly.
Pro Good build quality
High quality rubberized coating is used among other materials to give a quality product feel.
Pro CPI shift
CPI can be changed from 400 CPI up to 3600 CPI without having to interrupt workflow.
Pro A low lift-off-distance of about 1.5-1.8mm
The standard lift off distance on a cloth mouse pad is 1.5-1.8mm though it will be a bit higher when using a plastic pad being 2.2 - 2.4mm. To enable the plastic pad setting a certain button combination has to be pressed on the gaming mouse itself.
Pro Excellent 3200 CPI optical sensor
The Zowie FK1 gaming mouse uses an Avago 3310 optical sensor which is regarded as one of the best in the world. It has no built-in acceleration and no angle snapping. It’s practically jitter-less when set at 125 and 500Hz polling rate, and has barely noticeable jitter at 1000Hz.
The Avago 3310 has no native CPI, it is made to have each step of 50 CPI work as well as the previous one. With CPI steps of 400/800/1600/3200 for the FK1, all CPI choices should work equally well.
Pro Can be used by both righties and lefties
The Zowie FK1 gaming mouse uses an ambidextrous design with a wide base for the palm rest.
Pro Comfortable for most grip types
FK1 has a very universal shape and size, making it a safe choice for most people regardless of grip type and hand size. Except for people with large hands who use the palm grip, who may need a larger model of the mouse.
Pro No unnecessary functionality
Zowie has kept the mouse remarkably simple. There's no RGB lighting, adjustable weights, or superfluous buttons that end up only getting in the way. It's plug-and-play and requires no additional software. You can customize only the essential settings such as lift off distance, polling rate, or switch between left or right-handed modes with just a combination of specific button presses.
Pro Ships with a set of replacement feet
The Zowie gaming mouse has an extra pair of mouse feet in the box so users can replace their old ones when the time comes.
Pro Switches have a bit harder press so you don't accidentally kill your teammates
Cons
Con Scroll wheel is shallow and loose
Like the versions before it, the scroll wheel feels shallow and loose.
Con Lift off distance too high
The lift off distance is too high for this device but it can be fixed by using the tape trick.
Con Superseded by Logitech G400s
This unit is no longer in production though some units can still be found on Amazon and Ebay.
Con Two of the side buttons are unutilized in normal use
While the mouse has four side buttons, only two of them can be used at a time, depending on which hand you are using it with.
Con A bigger model might be needed for large handed people who prefer a palm grip
Due to its short height and the small hump on top of the mouse, it might not be suitable for people with large hands who prefer using a palm grip.
Con Slight lens rattle
There is some lens rattle when you pick up the device and shake it.

Con Only 4 DPI settings
Even though the ADNS-3310 sensor supports DPI settings in increments of 50, the FK1 only lets you choose between 400 / 800 / 1600 / 3200 DPI.
Con Not quite as comfortable as a non-ambidextrous mouse
Due to its thoroughly ambidextrous design, sometimes the ring and pinky fingers can touch the side buttons. Even though they are deactivated and won’t cause mispresses, they are still not as comfortable as non-ambidextrous designs.
Con DPI switch can't be used on-the-fly
A DPI switch is available, but it's located under the mouse, so it can't be used on-the-fly.
Con Pressing the main buttons may feel tiring after some time
Though it’s usually a matter of preference, the main buttons are a bit harder to press compared to other mice, which some people may find tiring after long periods of use.
Con Cord can break easily
The cheap rubber cord might be prone to breaking easily.
