I just learned about this controller on the Jenovi video about the 32X and thought I'd try to find out more about it. I found these videos that talk review it and thought I'd share them.
The XE-1AP Digital Intelligent Controller System is an analog controller released by Dempa Micom Soft in 1989 for the Sega Mega Drive, only in Japan. Despite this, several U.S. released games do support the controller, at least ten in total. The controller was also compatible with the Sharp X68000, FM Towns, FM Towns Marty, NEC PC-9801, and MSX computers.
https://youtu.be/R5ztXG7hPlM
https://youtu.be/XbdgIktZaGY
Nope, never seen that before. I bet they're not cheap to buy!
From what I've seen, they run about $150.
Looks cool if a little clunky.
Pricey too.
It is definitely pricey and it only offers an advantage for a few games.