I have about 12 flights on mine. First flight the battery was moving around inside . When the battery would move aft it flew great , when it moved forward it would hardly climb. I am using a 7 cell 720 battery pk. moved (back) so that only about a inch is showing in the battery compartment. It loops and rolls very good the first part of the flight , later I have to dive to loop and roll. I have hit the nose very hard and crushed it , a quick repair with a 8 oz. coffee cup and it had a real HOG nose and flew just as well. Most craft stores have foam safe spray paint for floral arangements that are just right for camo . I also left the wheels off. Once trimed it launches straight out and climbs good . I am at about 4500 ft in Utah. GET one