I have the Edge currently, but had the Extra for a time. I really enjoyed the plane but I had the first version with extremely thin tail feathers. With the first version, the plane would snap horribly when pulling full up, but I thought they fixed that with this later version with much thicker tail feathers. My Extra actually snapped on me at VERY low altitude and I didn't have time to recover[:@] My new Edge (which is almost identical) has the thicker tail feathers and it flies great. I can yank on the controls all I want and it show very little signs of snapping, if any.

Wing rocking is common with many planes (especially this size), and is something that you will have to find the right angle of attack for. I have both EF Edge and Yak and both have a little wing rocking if I don't get the angle of the harrier just right, and both have a much different angle for the best harrier with no wing rock. You can "catch" the wing rock with slight aileron compensations, but it just takes some practice. I found that the Extra does have an advantage in more IMAC stuff and tracks very well. To do some 3D stuff you will need to use your throttle a lot with the Extra and will demand a "honing" of your skills. It is a little more challenging to fly than the Acromaster, but is, in my opinion, a much better plane and makes one a better pilot. You might also try to balance the plane laterally. That will help greatly if you have one wing "heavier" than the other which adds to the rocking effect.

When I do a "wall" maneuver, the plane may try to fall to its right. You can use some rudder to correct this and it will straighten out.

I hope this helps you a little.