I like them, but most brown out so much as adults that it really ruins it for me. Obviously some keep their colors better than others but most do not.
The fact that they are recessive could also play into the equation. Who wants to put that much time/ money into a project that might turn out to be less than spectacular.
I'm really excited about the new Black Axanthics. Super expensive still but it looks like it could promise an axanthic that keeps its colors
http://www.jkobylkareptiles.com/snake_room.php?id=2