It consists, mostly, of the replay of multiple situations that took place in Mahou Sensei Negima! (the real TV series). There is some extra footage and pictures that weren't displayed neither on the OVAs nor on the series, some of them being very ecchi. Some background music is played and the sound effects and character voices are well employed. Art is basically the same as the series itself; just alright, lacking details and shadows. It does expand the viewer's knowledge of each character, individually.
Again, i'm not sure whether this should be seen before or after the series. If you watch these introductory films before, you'll know what will happen in some scenes of the anime, but you'll have better and more expanded knowledge of the characters while watching it; if you watch these introductory films afterwards, it'll serve as a wrap-up to the events that took place in the anime, and it will explain better the way of acting of each character.
One thing I'm certain of is that if you're going to watch the TV series, these should be seen as well, either before or after; you'll enjoy them.
