One of our guy's rubber banded his trainer wing on upside down and flew it after a debate at the "table of knowlage"at our field. Part way through the flite one of the aileron push rods broke and didn't know it till after he landed.
I'm an instructor and still fly trainers because they are so much low stress fun. Just started flying the new World Sky Raider Mach 1, $69.95 for $130.00 worth of plane.
I have a 80" P-51 with everything and it is high stress to fly and a relief when it's back on the ground.