I was excited about the LS-120 but I never quite convinced myself to stump up the money to pay for it.
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.