Dale the trainer in the video is a flat bottom wing, some trainers come with a semi symetrical wing giving it even more aerobatic capabilities than the one in the video. I too thought the trainer was slow and boring when I was training on my sig senior with a .46
this is an 81 inch wingspan trainer that weighs alot, but I was still able to do loops rolls and inverted flight. I built a PT40 as a second
plane and reduced the dihederal to 2" increased the control throws and put a .40 on it. it was a night and day difference the plane is much faster with good vertical pull, Not unlimited but reasonable. I love to put my trainer in a full throttle inverted 60 degree dive and pull it into an outside loop, I have done this many times and to my suprise the wings didn't fold.

Actually that is a great video to show beginners that although it is a basic trainer once you learn to fly, the plane can be used to train you to do basic aerobatics.