I've owned two mitsumi keyboards...and used my black ps/2 kb until I recently got a razor blackwidow and now the silent das keyboard I'm trying out (not sure which I like better...I prefer the layout of this one a bit more...but I like the feel of both switches...I'll need to type on this a while to see which keys I like more I think).
Mitsumi makes some of the better membrane type keyboards IMHO...and they're built pretty damned well (I on several occasions dropped my beige mitsumi with the pencil holder looking indentation at the top down big staircases in my college dorm when I was moving in and out way back when and it never hurt the thing...I finally grew tired of having to use an AT->PS/2 adapter and got one that didn't need that). The keys feel pretty good for a non-mechanical keyboard.
Another interesting fact: Mitsumi made the controllers for the NES, SNES, N64, PS1 (ALPS also made PS1 controllers...the general consensus is that they weren't as good...the Mitsumis were better in that they didn't blister your thumb...a lot of people seem to contend that it was because Mitsumi had more experience making control pads/d-pads), PS2, the original XBox controller, and the Wii-mote. They also manufacture the chassis/controls on the various Nintendo portables. I first stumbled upon this when I opened up an SNES controller and saw their name on the circuit board and recognized it as the maker of the keyboard I loved and looked more into them.
