Is this something that you could see yourself using? I am thinking of buying it (on Amazon) for my Windows PC. For years, I used a keyboard like the one pictured below and found that it was comfortable for typing, so the one above seems like it might be similarly comfortable. I quit using my ergonomic keyboard because I was jumping back and forth between an iMac and a MacBook, so I needed to get used to the smaller keyboard on the MacBook, which is the same size and configuration as the standard Apple keyboard.
I have never found the so-called ergonomic keyboards helpful for me. Maybe because I am not a good typist/keyboarder.
I've never found them helpful, either. I used to like a gel wrist pad to support my "mousing" wrist, though.
I don't think I'd want to test today, or since the arthritis came, but I used to be able to type more than a hundred words a minute, and carry on a conversation while I was typing.
If I were 20 again, I think I'd try one of the non-QWERTY keyboards, such as the DVORAK. At nearly 71, I'm not going to learn a new way of typing, though.
I recall the early ergonomic split keyboards that were like the second pic in your first comment, and may have test-driven one a coworker had, but not to any great extent. At some point I got tired of reaching over the right-hand keypad (like you see on your DVORAK keyboard) in order to use the mouse, and got a different set-up that I used for years and years. I am right-handed. First, I got a left-hand keyboard, which moved the keypad to the left: Then I started using a trac ball butted up against the right edge of the keyboard: So now I could sit centered behind the lettered part of the keyboard as I typed, and use the tracball without moving my arm around/picking up & putting down the mouse when I ran out of cord or reach/etc. I did not have to lean or move much to do anything. I really like tracballs, although after years I developed a knot on the knuckle of my thumb. It was not painful, but it was noticeable. I had already been using a dedicated extra keypad off to my left because in the 70s I used an adding machine/calculator extensively at work and taught myself to rapid-enter data with my left hand so I would not have to keep putting down my pencil to use the machine and then picking the pencil back up to write down the results. I lost the ability to data enter with my right hand. So getting a proper setup where I could stay centered over the keys and not lean one way or the other in order to type, "mouse" & data entry was as ergonomic as I needed to get to save my neck, back & shoulders. I had sore wrist issues off & on, but that was mainly an issue of getting the seat adjust properly so I had the proper wrist angle and then adjusting my monitor height. Since I don't do data-entry anymore and I do most of my surfing on the couch with an external monitor on a stand, I now use one of these that sits on my lap: I still have a dedicated USB keypad in case I need it, like when I was Treasurer for a couple of non-profits. Speaking of ergonomic, back in the day when I was buying business cards & brochures, the owner of a small graphics shop was an early adopter of these: Mark loved it. I was never tempted.