Open-source split keyboard based on the Kinesis Advantage's layout. This keyboard is available as a DIY project. Some commercial clones exist.
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Pro Ultimate customizability
You can map any key to any position easily using a simple GUI, including making hardware key layers. And, since the firmware is open source, you can modify it to do anything you want. Many of the hardware components can also be altered/replaced by equivalent parts.
Pro Split design lets you optimize positioning
You can arrange each side of the keyboard to match your hand positions. Helps keep your body straight and improve your posture.
Pro More actions for the thumb
Unlike other keyboards, like the Lexmark M15 and Cherry G80-5000, where the only action performable by the thumbs is punching the spacebar, ErgoDox has extra keys placed near the spacebar, within thumb reach. This prevents the thumbs from being a bit redundant.
Pro Open source
The ErgoDox has an open design, so if you want to modify anything at all, you can fork the Github repository.
Pro Many easily accessible keys for touch typists
There are more keys which are easily accessible for touch typists than on common keyboards.
Pro Firmware updates
Because of the nature of ErgoDox, within an open source community, there are advancements in firmware being made continuously.
Pro Comfortable for those with broad shoulders and large hands
Because of its split design, the ErgoDox lets you optimize the positioning of its halves according to what's best for your body shape, even if you have broad shoulders and large hands.
Pro Customization settings saved on the keyboard
With most programmable keyboards, you have to use their software in order to save and reuse your customizations. Using such keyboards on other systems "degrades" them to their default setting. Since with the ErgoDox the settings are saved directly on the keyboard, no matter the system where you're using it, your macros, tap dances and layers are always available.
Pro Key rows are aligned
Almost all the keyboards have a small row offset (for example, on a standard QWERTY keyboard, the A key is not directly below the Q key. On the ErgoDox, this isn't the case: keys form straight columns. Together with the movability of the two parts you can stretch your fingers straight on, not slightly sidewards. This helps with touch typing, since you just need to stretch your fingers straight onward to reach the key above, rather than stretching it onwards and sideways.
Getting a complete kit from Massdrop costs about $400. Sourcing each part individually ends up a bit under $200.
Con Needs to be assembled
This can be fun, but some people just want a working keyboard without having to spend three hours with a soldering iron. It's tricky to find pre-assembled ErgoDoxes, and they're not mass-produced. It is also possible to commission an enthusiast to build one up as well. Some Massdrops of the ErgoDox kit did came with an option allowing one to choose whether to have it pre-made or not.
Con Difficult to source individual components
You have to either source the individual components and build it yourself or wait for a Massdrop group purchase.
However, you can order it preassembled here.
Con Tends to move around during use
Due to its split structure and lack of sturdiness, it tends to move during use.
Con Hard to use with small hands
Because of its size, it's hard to use for those who have small hands.
Con Can't return it if you don't like it
As the Ergodox is an open source design, you'll either get each component individually or purchase it from Massdrop. Either way, it's not possible to return if you don't like it.