I have 1 from pets4homes and he is brilliant. No health issues whatsoever, I saw him with the rest of his litter and both parents, we went back 3 or 4 times just to make sure he was right for us and he is absolutely perfect.
I have another dog from a KC breeder advertised on the kennel clubs own website and the breeder was recommended by a friend. He has had no end of problems and issues (several inherited the breeder should have told us about) despite going through the exact same process as the other one. Saw him at home with mum and siblings, visited several times etc. The first vet check was fine and he went downhill from there. Bloody nightmare with that one.
My point being, you get good and bad no matter what you do. I did tonnes of research, googled names of breeders for reviews etc and attended breed shows/clubs to get the right information. Maybe I was unlucky or maybe everyone covers up the same sort of things and still breed with bitches that have health issues because its their livelihood.
Just so I don't get flamed we were repeatedly turned down for rescue dogs because of silly stuff like my children were too young despite always living with dogs. And I have cats so that crossed off loads of dogs anyway. One rescue said I lived to near a main road, its 300m away so not exactly 'close' and I was unrealistic about my 6ft high fence keeping a dog safe in the garden 