When comparing Razer Deathadder 2013 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 5th while Razer Deathadder 2013 is ranked 10th. 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 Comfortable gaming mouse for palm and claw grips
While being mainly designed for palm grips using a claw grip will still work, though with a weird placing for the palm.
Pro Left- and right-click buttons have a concave that helps fingers stay in place
The users fingers rest easily inside of the concave left and right buttons. By being concaved the users fingers also stay in place.

Pro Affordable
At $50 it's not an expensive gaming mouse for what it offers.
Pro Slightly larger than a common mouse
With dimensions, 127 mm/5.00” x 70 mm/2.76” x 44 mm/1.73”, Deathadder is just a bit bigger than an everyday gaming mouse.
Pro Accurate 6400 CPI optical sensor
The mouse has a 6400 CPI optical sensor with X & Y variable axis. No angle snapping, no acceleration, no prediction.
Pro Two side buttons in an easily accessible yet unobtrusive position
The two left side buttons are position so that they stay unobtrusive yet easily accessible.
Pro Braided cord
Helps prevent kinking, curling and protects the cable prolonging life of the gaming mouse.
Pro True rubber grip helps to get a better hold of the mouse
The mouse has a true rubber grip as opposed to common rubberized or plain plastic grips.

Pro Reliable, notched scroll wheel
High quality scroll wheel.
Pro Reasonably lightweight at 105 grams
The Razer Deathadder 2013 sits at a reasonable weight of 105 grams, which is 8 grams lighter than the previous 3.5 version.
Pro Synapse is well-designed driver software
Synapse can be a useful tool by saving a users setting to the cloud automatically, setting do not need to be remembered upon re-installs or using a friends PC.
Pro Rubber grips are smooth
Pro Left hand edition available
Razer offers a right and left hand edition for the Deathadder model.
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 Requires signing in and connecting to a server before the mouse can be used to its full potential
To get the latest drivers or edit settings you have to download "synapse" an "online cloud device updater and profile storage" application. You have to register an account with your email and have it running in the background constantly for changes to take effect.
Con Poor build quality
Con Scroll Wheel may stop working
You can look it up on youtube, there's a video which explains how you can fix it but you'll need to physically open up the mouse and void the warranty.
Con Driver for side buttons in not open source
The mouse has two button for thumb control. The driver for the mouse and is not open source and not available for Linux users.
Con Distracting lights, wich can be turned of this can be done trough the Synapse software
Although the lights on the mouse look nice, they may bother or be distracting to some people. If they are too distracting, they can be turned off but that does require proprietary software that many do not like having installed.

Con Software issues
Using Razer Synapse causes slower boot up times as well as forced online sign in to use which is just a cheap attempt at an always online DRM.
Con Middle click dies way too fast
Several users of this mouse have complained that the middle click doesn't last long, in some cases not even 1 year.
Con Rubber coating
Like all of razer's mice, this one has a rubber coating. Which means that it's hard to clean, will drip oil after long period of disuse and generally less comfortable than hard plastic.
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.
