Eman,
In common understanding, User exits are used for making some enhancements which can't be done through standard settings.
Your requirement can be achieved through standard configuration. I don't see any reason to go for this user exit even though coding have only very less no. of lines.
For notification purpose, you can use the mentioned coding with the appropriate documents mentioned.
Finally, its your call which one to go & which will be most suitable and convenient way.