LapLink was a great idea and solved a very real problem: You could not copy large files (anything larger than 1.44MB) around without this, tape, or modem (and when it worked you felt it was finally time to build that Ethernet network).
There was a very weird period of time there where floppy drives stopped advancing in capacity but the average file size had continued to outgrown them for years. I remember the iomega zip disks, despite their faults, actually showing up in a lot computer labs before flash drives finally buried them.