Hello, some time lurker here and after dealing with moderate to severe RSI and hacking different keyboards with varying results I (got my employer to) get me a muTron. After remapping some keys (space and other thumb keys mostly) and a couple of months of use I have to say I'm pretty happy with it. My RSI symptoms aren't half as bad as it has been (although it isn't necessarily due to the muTron). I will probably tweak the layout and remapping over time and will post if anyone is interested (or any other questions about it for that matter).
Pros:
- Many good keys for thumb and first finger (not much necessary for the little finger if you also remap the modifiers).
- Compact and portable (although looks like it could be even more compact if the top "bezel" could be shaved off which could maybe make it an excellent travel keyboard, will open it some time to check).
- Comparing with my colleagues 45g Topre HHKB/RealForce the key press action feels lighter (which is good if one has RSI, I also asked if they could make 30g ones but they only had 45g).
- Works fine on both Windows and Linux so far.
- Very good build
Cons:
- Left hand needs some relearning.
- Needs remapping of some keys (remapping the space bar is absolutely necessary).
- No dedicated F keys (and the Fn keys is in a quite useless position).
- Cable between keyboard halves is quite short and not removable.
- Arrow and PgUpDn clusters are not very convenient.
(- Smaller than standard keys are maybe not so good if you have fat fingers.)
(- Price if you have to pay out of pocket.)
Images of my setup: