personally I think the true test of a good breeder is their reaction and actions after they find out one of their pups they sold has something wrong with them.
For example, I have a std poodle that we have been spending more then $200 a month at the vet for the past 2 years!!! he has had multiple problems, some genetic, some rare...but when I called the breeder just to let them know what has been going on..I was rebuffed, questioned and they wished to speak to my vet. i gave them full access to speak with my vet, my vet then told me that they were 'A piece of work...' They accused the vet of lying (do multiple blood tests/panels lie??) and trying to extort money...the funny thing was I NEVER mentioned money nor did he...
Any warm and fuzzy feeling I had beforehand is now GONE about this breeder.
And yes they are STILL breeding his parents