Meh ... don't like it at all. I find even the "high" polyphony of Palestrina inferior to chant, but it's OK. I didn't care for this composition.
Now, if +Sanborn et al. are serious about their strong anti-"una cuм" stance, they should probably avoid using the composition of a "non-Catholic" during the Mass. I don't have a problem with that part, because I don't hold that the man was categorically non-Catholic (without knowing more about him). But either you believe the NO is a non-Catholic sect simpliciter or you don't. I wouldn't want a composition by some Lutheran at a Catholic Mass.