Sounds great.
I was able to coax some nice sounds out of the Special this weekend. One thing I realized is that the guitars action was too low from the factory, so I raised it up a bit and adjusted the pickup heights. I tried it through a couple different amps and with a couple different dirt boxes and generally was very pleased with what I am able to get out of it.
Results?
1. High gain is not your friend with P-90's. Aside from the noise they get a bit fizzy in the high end and loose in the low end. This has always been a gripe of mine with them, and I guess it really doesn't matter because I have other guitars that excel with gobs of gain.
2. With medium gain, like in the clip here, they really do come to life and can be quite expressive. I realize with the action too low on the guitar it was making me play with an extremely light touch and when I raised it up a bit I was able to dig in more and that really brings the best out of the pickups. This is where I will live with this guitar. My favorite sounds so far have been the Mark 5 in Crunch mode with the gain at about noon and mid/boost at about 2:00 and through my Princeton with, wait for it, a DS-1 with the gain around 1 or 2. Come to think if it, the best overall sound has been with the DS-1: I can roll back the volume to slightly overdriven or open it up to full '70's style crunch with everything in between. It has a nice "feel' through that setup as well.
3. They are only OK with a clean amp. I'd hoped they would have a bit more shimmer and sparkle into a clean amp but I'll be sticking with the Firebirds for pure cleans. Where they do sound nice going clean is with a pushed sound, just a touch of OD but dialed back so you only get the first hints of hair with the volume wide open and smacking the strings really hard. Like that I was getting great piano-like punch and bloom from the wound strings.
3. I definitely prefer the sound of the neck pickup. You can do 90% of what the guitar is good at with the neck pickup alone, or the middle position. I found myself only switching to the bridge when I really needed to cut through while using a phaser or delay.
So, yeah, after tweaking the setup and trying out some different rig configurations I am loving both the guitar and the sound of the P-90's. Nope, they are not going to displace any of my humbuckers, but it's nice to have a very different sound than anything else that I own.