@rgleas: Yes, I enjoy typing on the HHKB Pro Hybrid Type-S. Before acquiring this latest update in the HHKB line, I used a HHKB Pro 2 that I lubed and silenced myself with my own silencing rings. I used that HHKB Pro 2 almost exclusively for about 5 years in my home office, and I have two others that I still use on two of my computers at work.
I don't use the HHKB merely because it is quiet -- I like the 60% form factor, layout, feel, appearance, and quality components as well. A great deal of thought went into the design of the HHKB. It was developed by Prof. Wada, a computer scientist at the University of Tokyo, after years of research. The first-generation was introduced in 1996 followed by the Pro in 2003, the Pro 2 in 2006, and the Pro Classic and Pro Hybrid in 2020.
In particular, I like the HHKB layout -- in fact, I quickly became addicted to it. My keyboard collection is extensive, but all the keyboards that I have in my rotation have been remapped to a layout as close as possible to that of the HHKB.
Before discovering the HHKB, I used Model M boards at home and work. When I rediscoved Model F keyboards, I liked the Model F switches so much, I thought it would be great if there were a 60% Model F keyboard in the HHKB layout. Then, along came Ellipse and his F62/F77 project. It was a no-brainer for me to order these for both my home and work offices.
My F62 has the split backspace and split right shift of the HHKB. It has two additional keys on the bottom row, but otherwise the F62 and HHKB boards have the same layout, so it is very easy to go back and forth between the two keyboards.