RE: SDX HIROBO
The SDX is a superb helicopter. It is lightweight and nearly half the cost of a Synergy N5c or MA Fury 55. I have two of them - one powered by a YS56 and the other by an OS55 DRS. I can not tell the difference in power between the pair of them.
I would like to convert one to flybarless just for comparison's sake; however, these machines will do anything I can do from smack to big sky, to just shooting autos.
They are under appreciated for sure and I think if more people saw them, there would be renewed interest in them. They have not been really promoted in the US except by the pilot reps.