Eric: I would make sure you try out a P90 guitar before you do any swapping. If you are used to a humbucker you may not be able to put up with the noise of a P90.
Also the cheaper they are the more noise there is. They pick up every electrical signal and in some cases radio programs. They are only humcancelling in the middle position with both volumes fairly close. They are in a world of their own tone wise. But if you like the raw punch of it they might suit you well. I am only saying this because if you are used to a quiet humbucking guitar, or a Strat with hum cancelling pickup selections you will notice the difference immediately. Also make sure you use the same amp as you have at home if at all possible.
Oh and by "quiet" I mean no background humming, only the sound of the strings being picked.
The Blues is alright!
Guitars: 1968 Gibson SG, 2005 Gibson SG Standard, 2006 Gibson LP Classic Gold top, 2004 Epiphone Elitist LP Custom, 1996 Gibson Les Paul Standard. 2001 Epiphone Sheraton II, 2007 Epiphone G400.
Fender Strats: 1996 Fender 68 Reissue CIJ, 2008 Squier CV 50s, 2009 Squier CV 50s Tele Butterescotch Blonde
Amps: Blues Junior Special edition Jensen in Brown Tolex with Wheat front, 65 Deluxe Reverb reissue,1970 Sonax reverb by Traynor, Avatar Custom 2/12 Cabinet with Eminence Legend V1216 speakers,
2008 DSL100 Marshall Amp , Fender Super Champ XD,Fender Vibro Champ XD
Effects and Pedals: Fulltone Fulldrive II, Fulltone OCD, Fulltone Mini Deja Vibe, Fulltone Fat Boost, Dunlop Crybaby Wah, Boss DS1, Boss DD20 Giga Delay, Boss TU2 tuner, Boss BD2, Ibanez TS9 Tube screamer, Zoom 505. Radial tonebone hot british.