OK, I own a Goldberg Matrix 3D, I have a .76 gms 2 stroke in it, and this plane is the most troublesome airplane I have ever owned! It has been nothing but trouble for me since i bought it as an arf. The wings have a sweep back in it kind of like a jet, so you would think it will handle speeds well, but think again! I was flying it at half throttle when the wings actually start to flutter, when i brought it down and looked at the wings, the ribs were cracked, the ailerons were stripped from the servo, and the tail was loose. And you have to be pretty good to actually torque roll this plane, and it lands very fast. The point i am trying to make is this plane is by far the worst plane carl goldberg has under his name, i cant believe he actually puts his name on it, i'd be embarrassed. I don't mean to complain but im just warning everyone who is thinking about buying a Matrix. If anyone else has a matrix, please give me your reviews.