Have this adapter been tested with HD drives and disks?
id really like an HD option for floppys...
I actually do not know. As I have only tried them in Amiga500's. I have two of those machines, and they both have such a cable. It was cheaper than getting a refurbished drive. In DD mode, they I have not yet discovered any bugs. That said, I have not tried every Amiga game out there, only these 350 to 400 floppy disks that I have, are loading perfectly.
Another thing, is that the HD detection switch inside the drive, are still working. So I have to put a piece of tape on the HD holes on my floppy disks. So I guess they might work. Uhhh... And you need to be aware, that the seller have stated in the add, that they are not Escom compatible at all. It is because of that mod, that Escom did to 1200 boards.