My recollection was that it was: - Slightly larger than the contemporary Zip disks. - Cheaper than a Zip drive. - Could just replace your existing floppy drive, since it was backwards-compatible.
I don't know if it was as fast or robust as a Zip disk - it definitely didn't have the same mind share, though.
(I owned an ATAPI variant of this drive for time, but I sadly only ever used it for reading and writing normal disks of normal formatting.)
Maybe the earlier 120MB drive hardware could have been physically capable of it but the drive firmware did not support it.
Eventually, right here, we'll all collectively remember the whole truth about the mysteries of this conglomerated and seldom-used removable media format.