I have read Ed Moorman's article on end plates. Does anyone else have firsthand experience with these? I am planning to use them on a sport plane. They will attach with 4 screws,so I can add or delete them at the field. I am new to these, and I am looking for input.
I have average flying skills and would not want to get in over my head.

By average skills, I mean I can do the basic school maneuvers in a left or right hand pattern and can do a reasonable performance of advanced maneuvers.
Thanks in advance. Happy landings Tony