I just got the Sabbath pack as well ..
It's hard to say right now because I haven't tried it with p90 pickups yet .
So far I've played through it with an ibananez js2450 w/ passive DiMaggios
and an Eii eclipse with active EMG's,
with those 2 guitars it wasn't there for me , It sounded a bit muddy and tinny , and not quite right.
It helped to split the coils and bring down the presence and treble a bit , but with those 2 guitars it wasn't plug and play for me with the sabbath pack .
I'm thinking the p90's are essential to getting Iommy's tone.
I was blown away by TJ's EVH pack and I really like the AC/DC pack as well..
I definitely want to try the sabbath pack with some p90's next cause it sounded really good on TJ's demo.
Have you tried it with p90 's ?