Many firearms instructors will tell you-beware of those that travel, grab a brief case, go a couple hours from home and you are suddenly and "Expert"
I am in no way directing this statement at any of the names previously mentioned, but there are some traveling shows with zero street cred, zero real skill, collecting cash because they are a "new name" in town.
Multiple instructors, multiple options for technique, different ideas, we all continue to learn from one another. Whatever you choose, training and trigger time shouldn't hurt! Enjoy