I find Ken's P90's more responsive to different intensity of pick attack than any other pups I've played. The sonic characteristics change a lot as I go from lightly brushing the strings to really digging in. And they sound good now matter how hard I hit them. They give good, tight bass response, and a nice bright high end without sounding shrill. The midrange is where the real meat of the sound is, but it's not a one-trick pony. They sound good in a variety of amplified circumstances, whether clean or at varying levels of preamp and/or power tube distortion.
My current favorite sound for them is actually when playing through my Vox AC4TV through a 1x12" cab on the quarter-watt setting, volume at about 75% (the gain gets a little mushy when you wind it up louder in the 1/4 wat setting). It actually gets better at 1 watt or 4 watts, but other people who live in my house aren't nuts about the higher volume. But in any case: This is a fun little amp.