I just put one togather this past week. First flight, broken aleron hinges almost lost plane! Replaced with new Sig hinges but broke one after a few flights. Noticed one of my elevator hinges broken ! Decided to strip them all and install Robart hinges, that should cure that problem.
I also sealed all the control surface gaps.
With the CG set per book the plane was hard to hover and slugish. After rearrangeing the battry pack and receiver this plane has come ALIVE! I'm running a MDS .58 with the 12.25x3.3/4 prop and it will pull up outa sight from a hover. This engine runs great BTW, it is the second one I have had and they both do a good job for me.

I hope no one else got the crappy hinge material that was in my kit. Other than that I have no gripes! Great flyer.