I've had them in two guitars now. A heritage Hollowbody with a carved top, which I didn't love, mostly because it was prone to feedback at low volumes. And now, the Titan KR1. I've got to say they sound fantastic. Despite being unpotted, I can't make them squeal. I'm sure at high enough volumes, close enough to the amp, they would. As is they really have that 3D quality. Almost as if someone had found a way to get just a hint of the acoustic sound of the guitar blended in to make it sound more alive. You don't have to take my word for it, John B of Premier Guitar did two demos of one with Seth Lovers in it. I think you can also find them pretty commonly in the neck of certain G&L Bluesboys.