....Though you perhaps don't need many of those features for just accessing a few amiga disks.
I cant comment on the quality of either, I've had some cheap crap off ebay thats been great, and some that is just crap... do you own either one of them?
Anyway they're well covered already, I'm not putting anyones product down or judging it based on a price but obviously the cheaper device is more accessible to more people...
Well the eBay listing you gave is 50 quid and the HxC floppy emulator is 69 Euros which is roughly 50 quid too.
http://lotharek.pl/product.php?pid=13