Functionally, they're not very different. The CZ has onboard controllers so over all, it's thinners, it has a e-ink display so it burn less battery. The Corne uses separate wireless controller (bluemicro840), so I have to design a case around this controller, thus making the case thicker and less refined than the CZ. It also can use an e-ink screen (the nice!view), but it's not very easy to find, so I stick with OLED screens. My version can accommodate a huge battery so it can last months event with OLED screens.
Cool, thanks for the description! I’m interested in buying a pre built keyboard optimized for traveling. Which configuration would you recommend from your site?