Well, based on the info here, I went ahead and ordered some j-stiks and extenders for my MAME cab. I like the idea of being able to switch easily between 4-way and 8-way, and had I known about that feature sooner, I probably would have done this long ago for the MAME cab.
Jeremy - how exactly does switching between 4-way and 8-way work, and does it work well?
M.Schrok, I'll post back with feedback once I get the sticks in and installed, if you'd like.