I had tons of flights in mine before I sold it and this is what I learned:

Dont use take off flaps, it makes the jet wheel barrel and like to get it in the air before it's ready!

Use very little rudder if any! I like rudder in my jets but the rudder is extremely effective and causes roll!! I had no more than 1/4" of travel in mine and that was still a lot...

Be sure the nose gear is on a separate channel, lots of the crashes were guys leaving the nose and rudder on the same channel, they would trim it in the ground for the nose gear and not realize that they added a tiny bit of rudder trim, when the jet would lift off the rudder would roll it over and then into the ground....

Crosswinds.... I flew mine in crosswinds every so often, it is totally doable but remember the rudder will add lots of roll! The jet will weather vane in the crosswind and some guys would try to compensate with rudder and roll it into the ground. The anehdrial also is a bit of issue with the crosswind but if you keep it in the ground longer it won't have a problem.

The jet definitely likes to shimmy around when getting slow but it never seemed to be a problem.

If Iwere to build another I would put a cortex or 3e on it and I think it would improve the airplane quite abit, but still very minimal rudder!!!!!