Abjurant Champion is a wee bit overpowered it seems. Although, since they don't have any ability to ignore spell failure, that does rein them in a bit. OK, a very little bit to be sure.
Actually, the most amusing thing about the class is that apparently the writer doesn't even know the schools of basic spells and nobody bothered to check him on it. Mage Armor is not and never has been an abjuration. Yet the text strongly implies that it is. In fact, I know of no official abjuration that grants an armor bonus, (shield yes, deflection, of course) seriously restricting the usefulness of their basic ability. (I'm sure someone can find something somewhere, with enough hunting)
Not that I mind. They still seem mighty strong. Imagine if they did what the author seems to think they should.