I had a quick look, and this is a working kennel. Are you looking for a working dog,? And if you want a working line dog as a pet, do you know what you are getting into? They can be fabulous pets, but they are hard work.
They have a lot of dogs, and several different breeds, but that is not uncommon amongst gamekeepers and people who pick up for a living. They also have a lot of litters (up to six a year), so I'd want to be sure that the dams and puppies were getting what they needed in terms of care and socialisation, especially given that the breeder has a large kennel of dogs to train and exercise.
Check them out for health tests and age at first litter and so on on Champdogs. You can also look at the KC website if you sign up.
If you want people's personal opinions on the breeder, it would be worth your while to join something like the Gundog Training for Novices page on FB. If you ask straight up about a breeder, your post will probably be deleted as off topic, but if you say you're thinking about getting a cocker puppy (or whatever) and what do you need to know, you should get loads of advice. It's a helpful page.