Never heard of this accelerator... (nope, not mine. personally I am a bit skeptical and frankly rather suspicious of it.)
I checked it out.
It looks legit to me.
First one I've seen too.
This is legit.
Wow! Cool card! I remember a friend of mine designed a board for me , for my II+ , that when I would bootup the Apple II+ I would have instant DOS 3.3 in memory! The roms on this board contained all the file information for DOS 3.3! Didn't need any Diskette or anything! I just wish I didn't get rid of all the hardware and software I had years ago :O( Sucks when that happends!