To be completely blunt, you will generally never know for certain whether or not a member maintains proper professional integrity until you do business with them yourself. Just because someone possess a reputation, or lacks one, does not necessarily mean that they will be completely honest, or dishonest, during a transaction. That being said, I have purchased roughly 15-16 chams from forum members exclusively, and while that alone is not a large enough sample to make any sweeping generalizations regarding trustworthiness, most of my transactions have been rather painless if not completely satisfactory. If you do not wish to purchase directly from a large chain, then I would recommend reviewing some of the site sponsors regarding their current availability depending on the species you are searching for. If you don't find what you are looking for feel free to pm me and I will provide with a couple names of trusted private/casual breeders that you may take an interest in.