In 2012, Kinesis Freestyle 2 came out. This new model replaces the previous.
Here's the major improvement.
They also comes with a Mac version (colored white). amazon Though, i think it's identical to the PC Black version except the {❖ Win, Alt} keys are swapped to be {Opt, Cmd}. Either version, this keyboard does not require any extra driver software. Just plug and play. Nice thing is that it has Copy, Cut, Paste, keys on the left.
They offer several stands, each with a fancy name. The price varies from $25 to $200. Without stand is called “Solo”.
Not sure what keyswitch mechanism it is using exactly, but supposedly a better switch than rubber dome. On their site, it says it's tactile but quiet. 〔☛ Guide to Computer Keyboard Key Switch Mechanisms〕
The function keys are continuous, without gaps. That's bad, because it'll be difficult to press the middle ones without sight.
Split spacebar: Nice! Condensed arrow keys: bad!
For those of you Emacs users or heavy Alt key users, look at the distance of F to Alt. On Microsoft's Ergonomic 4000 or Natural Elite, the Alt is between X and C, so it's a easy thumb-curl to press Alt. But on Fellowes, you have to curl much more.
Majority of reviews on amazon are positive, many prefer it over Microsoft ones. The keys are the type that requires more pressure. Here's the official website for this keyboard: fellowes.com 98915 split design keyboard.