I just used it for the first time last week on LH for FRA-BUD-FRA.

What I like:
Can purchase from anywhere in the world, as long as you have a credit card and a net connection.
List automatically.
Can refund/ change tickets through the website if needed.

What I do not like:
It can only be used on the airline you booked for, unlike paper ZEDs, which can be used on any ZED carrier.