Recs.
Updated
A membrane keyboard that is less complicated than the Kinesis and considerably cheaper.
Specs
Pros
Pro Ergonomically shaped
Our hands naturally rest angled when in front of us, and this keyboard has been built to conform to that, rather than having us awkwardly trying to straighten our hands on a regular flat keyboard, putting strain on our wrists. The keyboard is also curved into a dome shape, which contributes to its ergonomic shape.
Pro Number pad can be placed where it is more convenient
Since the number pad is a separate part from the main keyboard, its position can adjusted and it can be moved out of the way when it isn't being used. This allows for a more ergonomic mouse use, since it can be placed closer to the keyboard, just like in a tenkeyless design.
Pro Very comfortable
Using this keyboard with vim bindings you can sometimes nearly forget there's a keyboard between you and the editor.
Cons
Con Bad separation of key clusters
The Page Up, Page Down, Home, Insert, End, Delete and Arrow keys are squeezed together, right next to Enter, right Shift and right Control, without any physical barrier/marker to separate the two key clusters. Since this is not an usual layout, it is disorienting for users.
Con The key switches used aren't ideal for long typing sessions
The switches used are scissor switches, which are the ones used in many laptops. They provide shallow keystrokes which don't give the same feedback as a mechanical keyboard. These keys need to be bottomed out in order to activate, which creates some strain on your finger's joints as they are constantly hitting the bottom of the stroke. Scissor switches are also known to be less accurate than other keyboards.
Con Some keys aren't very reliable
Some keys (like Backspace or Enter), if not pressed perfectly perpendicularly, hit the shelf of the frame and get blocked on their way down. This means the stroke isn't registered and, on top of that, feels awkward. On the (slightly) bright side, this awkward feel acts as feedback that the key wasn't fully pressed.
Recommendations
Comments
Flagged Pros + Cons
Pro Detachable number pad
The number pad is detachable, which means that you can move it out of the way when you aren't using it. This allows for a more ergonomic mouse use, since it can be placed closer to the keyboard, just like in a tenkeyless design.