It may be hard to get a hold of Dave or Sandy at times but this is a small operation and that's the way it is. Their products are GREAT. He designs and builds the best flying ARF's I know off. I know his Extra has gotten some bad press due to aileron flutter. Can you imagine how frustrated he must get when he says not to use gas engines and NEVER fly fast and have people complain when there is flutter using a DA 50 wide open. I have his Extra, first batch, and there is nothing wrong with it if you follow what he says. It is by far the best IMAC/3D machine in this size. I have spoken to Dave at length several time at the WRAM show and a number of times on the phone. I have NEVER spoken to any other designer of my other models. Any inconveniences you may get will be well worth it in the end.