Yeah, hori also made this 6 button arcade stick (pic) called the "Fighting Stick PC". It is really nice. It has a metal case (no plastic) and after taking it apart to look inside, it has really smooth arcade style buttons that can be easily replaced if they ever fail. And the stick is extremely smooth and has micro switches which are more accurate. It has turbo and slow motion and also a 2button mode. I have had a lot of controllers and this is by far the best, smoothest, most accurate. It rarely shows up on ebay. I highly recommend it. It's easily worth $55-$90 including shipping. It's pretty expensive to ship overseas. Its a tad bigger than your DUO and is pretty heavy. It feels really industrial and I am really surprised how well it works after about 10+ years. I had to put a few tiny drop of grease on the restrictor plate when I first got it to ease the friction. I worship this thing. I have played so many games again that I haven't played in years because of this stick.
I also got the "imagineer arcade stick" which also has 6 buttons, slow motion, turbo switches. "Quad compatible"-It has cables so you can use it on Sega, Neo-Geo, Snes, or PCE. This is a decent controller but the joystick doesn't use micro switches, it has those rubber stoppers instead. It has an extremely heavy base plate so it wont slide around on the coffee table. I might use the guts of this to build an arcade stick with sanwa parts. That way I can use the final product on other game systems. I'm still undecided
. It would be nice to have a brand new sanwa arcade stick that works on my neo-geo, SNES, and PCE.
Those official NEC "turbo stick" for the PCE and for the tg16 are cheap. I could never go back to using one of those cheap joysticks after playing on the Hori.