I remember mostly ignoring Kermit back in my BBSing days; by the time "SuperKermit" came along, which could get performance competitive with ZMODEM, it alreayd seemed ancient.

Then, around 1991, a friend gave me access to his college Unix account so I could play with Gopher, Archie, and TinyFugue (the world of MUDs/MUCKs/etc.). The catch: to get to his account from my home machine, I had to call into a Florida state network that let you dial in and connect to machines on various college campuses. The network ran on some IBM minicomputer. And, it didn't connect to the Unix machine, oh no. It connected to a VAX, which was then on the same local network as the Unix machine.

So I had to dial in to the IBM machine, connect from it to a VAX, and then telnet from the VAX to the Unix box.

Incredibly, this all worked with only mildly annoying lag...but then I tried to transfer a file from the Unix machine to my personal machine. ZMODEM didn't work. XMODEM didn't work. I think I tried one or two other things that I've forgotten.

Then I remembered Kermit, and its reputation for being able to handle difficult connections. It got the file through on its first try.