We were very impressed with our Dane breeder. The health testing she does, her views on over vaccination, how much she cares for her dogs and the breed in general were all great points.
Gunnar's breeder is more of a hobbyist. She does basic health testing and works her dogs but she didn't "interview" us before placing Gunnar with us. If she didn't work her dogs and test them I'd consider her a BYB. She does care about the breed and her dogs are from good German stock and she doesn't overbreed the females.
Bruzer came from an elderly couple who bred 2 oversized out of standard, overweight pugs because they loved puppies. Clearly a BYB. Luckily he's been a healthy, vigorous dog and aside from being a bit shy, has no temperament issues.