Here is my experience
Okay, so I am actually getting a puppy from this breeder in about 3 and a half weeks from now. I just wanted to shed some light on my personal experience to date (and this will be my first GSD).
I have been talking with the daughter of the breeder, not Carol herself, even though I have met with Carol. Susan, is very lovely and has helped me through the whole process since I was interested last December. She has answered every question I have asked. What I was impressed with was when I visited them, she showed me every dog they had, did not skip one. I got to see temperaments of potential parents, and she suggested parents that would match my needs most. The place was clean, and the dogs looked very well taken care of. All dogs were very friendly to not only the breeder, but to my mom and I. And not overly friendly like a Golden, but were okay with interaction initiated by my part, etc. Also, I asked about health testing for the parents of my dog, and both have paper work (dad had a prelim of "Good" which she told me that it is not the "official" rating since he was younger than 2 years when he got it done, and mom also appeared to have "good" but the position was obscure so they will be re-doing them to send to get the OFA rating).
I believe the breeder knows her dogs, though I myself have no experience with reading pedigrees and do not neccessarily understand how breeders should match dogs up. I am still learning though, so others please don't be too harsh on me if I sound ignorant about the issue (educate me!).
I have also reached out to owners that have her dogs, and everyone I have talked to has had a positive experience (but of course there may be negative ones, I just have not come across any personally). They love their dogs and seem to be healthy, happy dogs. Many people around the Memphis area have their dogs. She keeps up with people through Facebook, and she has kept me updated with my pup every step of the way (I like the Facebook page better, sometimes the website is a little slow to be updated).
I cannot say anything though about my experience actually living with one of her dogs because I do not have him yet. He is already here and paid for, so I am getting him regardless; and he is super cute too.
I agree though that maybe looking into breeders who have titled their dogs and have clear health testing like for DM and elbow/hip HD would be a better option for what you may be looking for. This breeder though has what I want for my first GSD, and I am happy with the experience thus far.