I have used the killer B 'Wasp' models for over a decade with great pleasure, and the audio option [size=small](Limiter or no Limiter)[/size] is especially helpful with some models, such as any White's Classic series model. They have a sort of 'muffled' audio with most headphones, but the Killer B's enhanced that with a more brilliant audio response. I use them with almost every detector I own, have owned, or have borrowed.
The one issue, and only issue, that I have with the Killer B's 'Wasp' and the SunRay Pro Gold [size=small](essentially the same headphone by the same maker)[/size] is they often can pinch my ears a little more than I enjoy. The White's Pro Star headphones use the larger 'tank' type ear cup, similar to what Killer B uses on the 'Hornet' model, and I find them much more comfortable on a along day's hunt.
I'll still suggest you visit a local dealer and try headphones on for a good fit, check their comfort and make sure they are not floppy, then plug them in and hear how they sound.
Monte