Most important thing to remember is that websites mean nothing. A crappy breeder can have the best website....and you can be dazzled...as well as a great breeder can have no website or not much of one and have the best dogs.
Just means someone has good computer skills or can pay to have a nice website made.
You say this breeder imports all of the dogs? Do they put any titles on the dogs themselves? any conformation or working titles? Anyone with money can buy these dogs.
What health certifications does the breeder have on the dogs? Is it for hips, elbows, eyes and heart? Go to the OFA website
Orthopedic Foundation for Animals and put in the sire and dams names...they should have all of the health certs there.
Most breeder are very happy to answer questions...and they of course should be asking you questions. If all they wanted to do was sell a puppy...then I would be running.
Gina