I have seen the Mustang PTS and I think that it could be a good choice for a second plane, it is a plane that upgrades its self, when you feel comfortable you can add flaps and detach the airbrakes, and then it is a great choice to grow with. I have had some sticks and they are fun, I would recommend the GP version with its tricycle landing gear set up, as a second plane for those who have graduated successfully from a trainer and fly with great confidence. If you want to build I recommend the 4 star 40, it is also a great second plane and a good builder trainer.