I think mostly, I like how you can just plug right into the port and have everything you need Bus + Power.

i never tried to eject a HD20 to see what happens, when booted up from something else.

I was thinking, I could leave the floppy emu plugged in… eject the HD/20/emu… pop the sd card out. pop it into a modern machine… put files on there etc.. then pop it back in the floppy emu , hit a button and see it re-mount. and go.