I built one of these over the winter and have had several flights with it. I have a YS140DZ in there, and it will hover at about 1/3 throttle. All-up weight is 11.5 lbs, which is amazingly light for a plane this size. Speaking of size, it is HUGE, especially the length of the fuse. Be sure you have a way to get it to the field.
At about $250 at Tower, I think this is probably the best bargain out there. The plane will LOCK into a hover, and fly graceful pattern moves as well. Unlike a UCanDo, it will spin and tumble nicely. You can do an inverted flat spin that stops and hovers. I'm thinking that Goldberg is dumping these at $250, so I plan to buy a spare in case they discontinue them.