I must tell you about a rebreather course I took in La Paz. As being an instructor myself, I now understand how important it is to be the best instructor you can be. The instructor "I and a dive buddy who is also an instructor" had was one of the worst instructors I have ever had. This guy didn't read the material before hand nor did he know what he was doing. So the course was being by the seat of your pants. Even though I received certification card I know I will be taking another course. So the question I have has anyone had a bad experence with a course and why?