I had almost no issues with assembly. I was just use to large jets and i felt cramp working in the jet and trying to find spots for everything. I had one cylinder leak and it was replaced. Still have one leak in that replacement cylinder. I had 8411 in the elevators and i was told to change to hitec 7955 which i will do this week, by Binson who maiden the plane. Hopefully we can get another flight next week. I will keep you updated.