Coming late to this (as usual), I just returned a Logitech MX Keys keyboard as unsuitable. I wanted a wireless affair, backlighting would be cool (the glare from my monitor light obscures keys that aren't backlit), full size, good feedback. The Logitech seemed to fit the bill, I lurrve the MX mice, and just about every review was positive.
But now it is gone because:
* keys were flat. Yes, the entire thing is on a slope but the keycaps are all the same without any profiling.
* Lack of movement. Less than I am used to, and the tactile feedback was OK, but it just didn't feel right.
* Lack of separation between keys. Sure, there is a gap and the keys are dished but, perhaps because of the lack of travel, it was hard to tell when your finger was just out of bound and therefore the hand placement automatically corrected. Worst case was not feeling I was stabbing the right key when using the number pad (more on this in a mo).
It was a very nice keyboard indeed, and I was sorely tempted to keep it anyway, except it costs far too much. So now I am back to my trusty Dell SK-8115:
https://www.amazon.co.uk/dp/B003CO171CI realise there is a certain amount of muscle memory involved, but I think I gave the MX a fair trial. In typing this I haven't once looked at the keyboard - even when I press the wrong key I know where the right one should be and there it is. The number pad, as noted above, is the worst case example that turned me off. I never use it as a number pad, only as cursor keys. Yes, there is a set to the left, but I never use those for anything! Reason being, the number pad has the 5 in the middle and the + - * / all around, and the enter key next to it. Just a better cursor pad than the cursor keys, IME.
The SK8115 is pretty damn good. A bit rattly, I suppose, but I can type pretty fast and error free with it. Coding with the MX was just a slow pain. So my plan now is to convert a spare SK8115 to wireless somehow. One option is to embed a bluetooth doobrey, but I can see battery life being annoying. Another is to gut a sacrificial wireless keyboard and wire the clever parts to the Dell keys. Could end up a mess.
Just today, though, I noticed there is a TOM680 DIY keyboard. That kind of thing might work, but I expect it would be very costly and I couldn't spot a 108-key option. Anyone know of a reasonable source for that?