There are many good quality instructors out there. There are also many instructors who are not quality or who are imposters. What I recommend to all of my students is that you go through different instructors and take what you learn best form each instructor and put that into your tool box. There are many different ways to accomplish the same mission. If an Instructor tells you this is the ONLY way to do something or they have the best way, my advice is to excuse yourself from the class.