It is a great class depending on your teacher. My first gun was a Glock 19 as well. That just happened to be my teacher's main CCW so that was great. You learn a lot about how to shoot, grip, stance, calibers, safety rules, different kinds of guns, and more. I thought I knew a lot especially after hanging out on this board for a couple of months beforehand, but I ended up learning a lot. Plus, it can help you get concealed carry permits in some states. I highly recommend it.