Many people don't like Carvin pickups, but I like them in certain guitars.
Carvin guitars (in my limited experience) benefit greatly from having ALL the electronics yanked out and replaced with good aftermarket stuff.
The problem is that they often use those mini pots for everything and their control cavity routs combined with the positioning of their controls make it impossible to put in normal-sized pots without permanent modification.
I wonder if the reason the pickups get bad press is people are hearing them in maple neck through body guitars with ebony fretboards, and the guitar's construction can make it sound a little rigid. Kramer and Jackson neck thru guitars that I've played have sounded that way too. With that kind of body construction I think the guitars would benefit from pickups that added some bottom and had a warm high end.
I am thinking about picking a couple of them up. Have any of you guys ever played with them? and what do you guys think about them?