You should finally have them in about a week or two.
We're catching up, and will deliver every pre-order in about two months. Thanks for your patience!
They both have apps for mapping keys, but the kinesis app is Windows and Mac only, the UHK app runs on Linux (probably those others too. I wouldn't know).
You can fit the two halves of the UHK together to form a regular non-split keyboard. That is impossible with the Kinesis.
I like them both, but the Kinesis just feels so nice and solid. I made the left-side space bar a function key and that makes the function keys and ESC usable enough for me. I'm an emacs user so I don't use those that much anyway.
Was that a typo? Above you said the Kinesis feels pretty cheap.
But seriously, I really enjoy split keyboards. I've got a trackpad in between (!) the keyboard halves, and I really like that kind of setup.
One can drive GUIs with keyboards to an extent, including the escape key to cancel dialogues and pop-up/drop-down menus. This is true for many full-screen TUIs too, including orthodox file managers for starters.
THEN I Use someone eLSEs keyboarD AND...
Hadn't internalized the lack of an ESC key, so they are probably going into a closet.
I'm really happy with my Kinesis Gaming keyboards. Half a dozen of my cow-orkers have bought them based on just a few minutes of using the one on my desk. They're the best keyboards I've used in the last 20 years, since Microsoft's Natural keyboards started to crater in design and build quality.