i haven't heard of them. i searched jersey for a breeder when i was looking to get my yorkie and didn't find one i like. so i got my puppy from a "breeder" in PA (which i DO NOT recommend).
However, I have discovered a breeder that i do like now. Thomas Becker of Wingold yorkies. I know of him because he had to bring one of his puppies to the vet hosp where i used to work. I've emailed him and he is very nice to talk to. here is his website
Tom's Yorkies - AKC Champion Breeder in New Jersey
i have not purchased a puppy from him nor do i know anything else about him, maybe other breeders do. i just know he cares about his yorkies and is a very nice man to talk to.