I only know of the three people who were unhappy they were sold and charged high prices for incorrect colors. As far as genetic issues, they haven't been breeding long enough to know if the new herd they have has those. From talking to them they bred chinchillas for awhile over 10 years ago and very recently bought a bunch of chins to start again. They wouldn't tell me from where or what the pedigrees were so I'm not sure what they have genetically. I do know some of the more exotic recessive lines do have a number of health issues that cause them to die early - in particular blue diamonds out of the imported Denmark lines, black pearls that are being sold through pet stores (imported via PSP from the Czech republic) and angoras.
There is another breeder not too far from DFW called East Texas Chinchillas, Kevin and Tonya McDonald and they are super nice and have healthy lines and really care about the chinchillas. They do have those colors and are happy to work with people.
I have met them in person and seen their animals and everybody I have spoken to has been extremely happy with the babies they've gotten from them. Good luck in your search!