haha, not fitted yet, just put the bare knuckle in the R6, must say underwhelmed, deffo difference in the freq response, but no spanky. although i have spent most of last two days dialling rig into my page sound for the R0 and its T-Top, so probably not a fair fight at mo.
BKP have several different types of P90 - which did you get? The nantucket has the punchy/tight low end of an alnico five magnet. It sounds like a bigger, tighter, tele pickup that can get nasty cranked up.