Hey tndefender! I got my Yorkie 4 months ago from Amazing Yorkies too. Deb Stillers was wonderful to work with and an obvious good breeder. My vet also mentioned to us at Muffin's first visit that she was extremely healthy and obviously came from a good breeder.
Deb does offer one of the better health guarantees that I had seen while doing research on different breeders. It's very generous.