I started on the Airflow 215. BIG mistake.
Way too big to start. When I realised that, I got an Orly 186. Heaven compared to the 215. I learned a lot faster. On the Orly I felt what I was doing(good and wrong..
) and acceleration is a lot better. Get a second hand Orly 186 and you'll be learning to kitesurf a lot quicker. You even could get am Olry 175 to learn on depending on your weight.
I've heard good stories about the smaller version so they should be a lot better than a 215.