The Matias’ claim to fame is using ALPS switches, which were used in some of Apple’s early keyboards, and are still a favorite to some people. While their website says the keyboard is programmable, it is minimally so. There are keys around the periphery of the keyboard that can be reprogrammed. This happens in the keyboard itself, which might be an advantage to some people. I have their ErgoPro for Mac, and it’s ‘okay’ on a scale of terrible to awesome.
I also have the Moonlander, and I really like it. It is fully programmable using their software. I believe this is based on QMK, which is the top of the line as far as keyboard software/firmware. This means for instance I have it programmed so that if I hold down my Z key, it acts as control, and if I tap it, it acts as regular Z.
I guess the most important thing is that I don’t have wrist pain from using the keyboard. (My mouse is still a bit problematic over long days, and I might switch to a Logi Trackman Marble Trackball Mouse that I have stowed away.
More discussion and mention of a couple of other keyboards I have: Moonlander mechanical keyboard