This OVA is much better than the first OVA (spring). This episode actually has a decent plot and some drama. As in the first OVA, the animation is very good, better than the original series. The characters are drawn a little differently (a different animation studio I suppose) but after watching both OVAs I'm getting used to it.
There's lots of fanservice which you expect from Negima, and even more than usual because it's an OVA.
This is definitely worth watching if you're a Negima fan and will whet your appetite for the whole 2nd season, if you haven't seen it yet.