Thanks guys !
I know this may not be the greatest device out there, but @ $12 shipped I thought I would try.
No home for it yet, but I will find a use.
Thanks JDFan for the info.
I was clearly looking in the wrong places online, IE - why I found no info I needed.
I've never tried Joy2Key but I read good things.
I know one of the biggest pains ever is on a set up with multiple Emulators, etc and using an Ipac (which is default MAME). You can not use certain buttons in certain emulators. Off memory Dreamcast and N64 emulation gave me an issue. Perhaps this little device with the Joy2Key could resolve that ?