Wow, I learned on Sig Kadet Senior (3 channel) that I built and had a blast flying it. I'd say the only real problem I had was on windy days. That big wing is easily caught and even with the tricycle gear it can be tricky to taxi. I remember flying real slow with mine, stall turns and flying inverted. Altitude can be your friend when learning. Boy I used to take it up high. Fearing other models, I used to fly it way too far out. But I always got it back and still have it. I should get it ready for next season. Oh, I eventually moved to an Avistar and had a blast with that. The transition went fine. In fact I liked the Avistar so much that I decided to get my second Avistar and I am presently putting that together. Just for fun.

If the Kadet is available for a good price, you can learn a lot from it. Even as a 3 channel.