I played with TECO on Unix for a while many years ago as well as a similar character editor (I think it was called SPEED) on the Data General MV8000 Eagle at Texas A&M. Editing with those editors is like solving a puzzle. It was fun, but I always moved back to a screen editor to be more productive. However, I imagine on a slow Teletype, TECO was a good way to go because it is so terse.
