Fenton's correct. Keep it light. 2 cell lipos, light powerplant, smallest possible electronics.

If you are seeing flutter, you're flying too fast. This is a 3D plane, not a pattern plane. Fly it low and slow...post stall. That's what it was designed to do, and it does it well.

Also, the flexing is not a bad thing...if it's flexing...it's not breaking!

These planes are good for learning to use the left stick. Most flyers seem to take off, and not touch the left stick until they're ready to land.