I suppose it depends what you actually want the pup for, what you want from the adult dog. I use my own testing methods not anyone elses. If the breeder will not allow my tests, then I walk away. I dont like the spanish attempt at copying the presa with their alanos etc I am a hardcore fanatic. Each to there own though, live and let live.
Edit, PS Curto became a puppy miller breeding for money in the early 2000s. When they became popular in the USA, he changed his breeding program into a commercial entity. All my stock date way back before then.
Got to love Thomas in the video at the end, a very famous dog world wide.