Well, Wingsdad and a few others said to be patient and give the P90's some time and sure enough, they are really starting to grow on me. I had the guitar running through the Epi Valve Jr and my Vox at the same time tonight and was getting some really great sound out of it. Ran the guitar in to the RP350 and then ran RP350 to both amps. I then bypassed the RP350 effects and used the amps straight, only making different adjustments and presets to the Vox.

Got some interesting sound. Also ran the Wildkat straight into each individually and those P90's just seemed to purr. I wouldn't really want more than one or two guitars with P90's, but it's a nice choice to have in the mix.