I get a little antsy about taking my snakes anywhere other reptiles have been or will be. A vet office is definitely much cleaner than a pet store, but if the risk isn't necessary I would consider not doing it. That's just me though. If they seem like a good, knowledgeable, reptile vet clinic it could be fun. Just be careful of the advice you hear. Even veterinarians aren't ball python husbandry experts. They are experts when it comes to surgeries/health of animals, but they most likely don't have decades of ball python specific husbandry experience.