Re: STAGMAG USERS!!! With which strat pup do you compare the split tone?
I could imagine an APS 1 would be close, because the Stag Mag uses Alnico2 mags, which makes the split tone a bit softer and rounder. I think a Stag Mag with A-5 would be too bright for a humbucker in series mode, so this might be the reason.
I like the Stag Mag in the neck position, because it's something between a sweet Paf and a clear single coil. Like a single-coil, just louder and smoother (and hum-free) or like a PAF, just more articulate. Very underrated as a neck humbucker.
Of course, it should used with a bridge-humbucker with moderate/high output.