One thing to watch for is that like many other pattern planes the Impact will fly with the CG much further aft than is desirable. It wont do any nasties like dropping a wing when slowing for landing or flying inverted with little or no down elevator.

What it will do is fail to lock onto lines, especially in yaw, and be difficult to land as it appears to run out of lift suddenly without wing dropping. Mine kind of snuck up on this situation as I worked with progressively lighter large electric props and a change in spinner. Moving the flight batteries forward to restore the CG to the back of the wing tube was a revelation in its flying characteristics.

Malcolm