I've never even seen one, actually.
From what I've heard, they can be quite sensitive, but also very tenacious. I don't think they're an easy breed for a novice dog owner....they can be kind of drivey and protective, bond closely with the family, and are pretty high energy especially as puppies. I think they're also VERY smart. A smart dog does not mean an easy dog. Smart dogs figure out how to get into trouble very quickly.
They sound a lot like JRTs, temperment-wise, but less inclined to make friends with strangers.