Yeah, welcome to RC Briguy. It's a wonderful addiction!

You won't find a better way then this to spend time with your son either.

Personally, I'd go with a more traditional trainer, like the Avistar. Don't get me wrong, the Kadet line is exceptional, and people have been learning to fly on them for years. But they are extremely docile planes, capable of less speed and aerobatics than a trainer, and you may become tired of it sooner.

If you do decide on the Kadet, be sure to modify it for ailerons. Three channels works fine on a Kadet, but you should learn with ailerons.

Just my opinion.
Dennis-