I've always been fascinated by the rarity and elitism of such devices.
However, from a practical standpoint, I don't understand why such low transfer rate device ended up in a bus commonly used for its performance.
Best candidates I can think of were Akai audio samplers that implemented the bus and also had a floppy drive.
For what usage in computers were these devices for?
Note: I am talking about 1440 KiB floppies, not Iomega Zip drives; for those, the benefit was obviously evident.