Mincer,
The Iommi is a beast in the Les Paul. I just spent the last hour or so and so far here are my thoughts.
Very full and thick with out being flubby at all. The Les Paul sounds huge now. It had a 498t in the bridge before which sounded ice picky to me.
The Iommi has a really throaty midrange and a really nice high end that cuts, but does not at all sound ice picky. Cleans up really well too, can go from full on to crunchy with the volume.
First Gibson pickup I really like. The crazy part to me is on full gain you still can get note separation.
Very very cool pickup. Now I need to find another for the neck or at least something other than the 490r that is in it now....lol