FWIW, I have a Norton (not an Air Norton) in the bridge of a Les Paul. It might be helpful to you, since the DiMarzio page says, "The Air Norton started out simply to be the Airbucker version of the Norton".
In my LP, the Norton's tone is massive and glorious. NOT a traditional Les Paul tone, but wonderful nonetheless. The guitar I have it in is a replica built with 55-year-old woods (hy a luthier who knows how to build a serious Les Paul) so that has some effect on it for sure. But I tried a good ten or more pickups in the bridge (as well as in the neck) to find just the right tone for this guitar. The Norton has an incredible combination of high-end bite and midrange honk (think Duane Allman at Fillmore east) with a huge-but-tight low end.
In this particular guitar the Norton is not muddy at all. I use it for melodic rock and blues, but it could easily deliver Metallic-style rhythms. In a darker-sounding Les Paul I can imagine it getting a bit dark, but not really muddy. But if your LP has a bright bridge tone (like 99% of LPs do) the Norton might be a revelation for you.
I'd suggest calling or e-mailing DiMarzio to ask how the Air Norton would compare to the Norton in this type of guitar. I love the sound of the Norton in my (replica) Les Paul, and I doubt I'll ever replace it. The tone is so unique and cool that I can't imagine wanting to change it.