I don't know about the data transfer rate. I only know that it must be faster than a floppy drive and this device seems to allow any Amiga A500 or A500 Plus to have a SCSI hard drive drive fitted without looking for a "rare as hen's teeth" edge connector unit. No A500/A500 Plus units are available on http://www.gvp-m.com/productjapan.html .
I've just contacted the seller and will contact some more sellers on eBay Germany soon.
If you are interested in a SCSI-host for the A500, drop me a PM, I have one for offer.
