Time to bump this up since mine had arrived and I figured I'd give a small review as to how it is and how it operates:
The board is about the size of a 3 1/2 inch floppy. Very sturdy and well designed, and contains four LED indicator lights so that you can tell what is happening and when (mounting disks, loading, power..etc)
The install was pretty straightforward. Plug it in USB, install the drivers and run the software. What I have tested hookup wise thus far:
Plugged it directly into the internal Amiga 500 Floppy port using a standard floppy cable - Works of course as DF0:
Plugged it into the innards of an Amiga 1010 floppy drive and then plugged that into the Amiga 500 external floppy port - Works as DF1:
Plugged it into DF0:, mounted an ADF image of "XCopy", booted in, then mounted a random game ADF, and copied to a REAL disk on DF1:. Not that I plan on ever using that feature again, but regardless it worked perfectly.
As for loading disk images, it works perfectly. Every single disk image I have tried (that is Amiga 500 compatible of course) has worked. I did run into a slight snag in which I could not play multi disk games because the emulator did not seem to poll the second disk when mounted, but that was just a setting that needed to be changed. After that, everything worked great. I have tested dozens of games and demos thus far, and have not hit a single snag.
For those concerned about speed, there is no speed increase with the emulator. It loads in pretty much the exact same time it would take to load a real disk. I do not consider this a drawback however, because I think that if it did not mimic a real floppy drive in this respect I could be looking at some incompatibilities.
Where all seems to be perfect there is one tiny drawback, and that is NO write support, and this is a hardware limitation. In other words, ADF's mounted are read only through the emulator. This would mean you could not save your high scores on games that would take advantage of that. Although, there were certain games that I do remember that required the actual disk to be un-write protected to function correctly (Hoyle, Tetris) and these worked just fine without giving an error....so the emulator is doing something here to bypass that, and it is a good thing.
Bottom line is that this device is incredible. Can I recommend it? Absolutely! No longer having to shuffle disks is a great thing. It has successfully run image counterparts of each and every single original Amiga disk I own and then some. With literally thousands of disk images out there and the little time I have has using the device, it is hard to say exactly what the compatibility rate is. I can say again however that I have not come across an image that did not work, so my guess is that it is quite high :)In fact, I love it so much I purchased ANOTHER one for my brother, who loves the Amiga almost as much as I do!
The only real problem with this is probably the limited availability!