I love the PT-40.
It's the one plane I have flown with the attributes that a trainer should have. If you're high enough, let go of the sticks and it flies itself out of trouble.
It's easy to build, robust, and flies slowly enough so that you have a little time to react.

MANY trainers are 'WAY too fast. You don't have to peg the throttle to get the PT to fly.

Enjoy.