I always wanted one for my Turbo Duo given the used/cheap Strider ACD that I bought for $15 but I never got around to it. Plus, I'd have to also buy a region adapter to make it work on a US Duo! So it wouldn't be until the Magic Engine emulator when I finally got to play that ACD port to see just how awful it was!
I was also interested in Fatal Fury Special (not to mention SFII for my 6-button pad), Sapphire, a SuperGrafx itself, but gaming habits were dying off as I started my university studies, so didn't happen. But yeah, eventually when I discovered the world of emulation in late 2001-02, I got to download/play some of the missed opportunities from back when real hardware was the only game in town!