Landing gear strength is one problem but not the only one.

The plane is overall built very lightly. This isn't a flaw, it is done on purpose for light wing loading and power to weight ratio needed for 3D aerobatics. It won't hold up as well to some of the things other sport planes will.

The plane also has some huge control surfaces. These make it respond extremely quick to control inputs and it is very maneuverable. You can tame the throws of course to minimize problems in that area. The huge surfaces also lend themselves to fluttering if the speed of the airplane gets too high. Throttle management is very important.

My personal opinion is that a good sport type plane is better for actually learning how to fly correctly. They fly more like airplanes. Planes like the U-Can-do are fun but they fly more like over-powered kites or balloons to me. I've owned U-Can-Do's, Twists, 3D profiles, etc. but I like more traditional sport type planes better. That's just my preference though.