I had opportunity to test type on my old Amigas again. The linear Mitsumi switches in those were very smooth. I did not notice any friction on off-center key presses. I did notice, however, small differences between the keyboard in my Amiga 500 and Amiga 1200. The ones in the Amiga 500 appeared just a tiny bit lighter and bottoming out was a bit mushy while the Amiga 1200 keyboard was crisp. The sliders in the Amiga 500 were black but the sliders in the Amiga 1200 were white.
Anyway, my point is: Not all Mitsumis are the same.