I wouldn't buy it because loading a big bike is too tricky. In both of the videos where a Goldwing was loaded, the rider was putting his feet on the ground. They must have been really long legged. I couldn't reach the ground while on the trailer and there aren't enough places to put your feet on the trailer to keep the bike from falling over. Okay, I skipped over the photos to see the videos. They have added running boards now to put your feet on. So, it's probably okay if you can stand the price.
I bought an 8'x5' open utility trailer ($600) from Lowes to haul my ZN700 back from WI. It isn't quite long enough for my Venture unless I load it diagonally or remove the tail gate ramp. I'm not sure how to remove it yet. An enclosed trailer would be ideal to keep the road crud off the bike. For example, when I hauled my ZN700 from NC to FL in Feb 2010, there were lots of cars with road salt all over them going to Fl from the frozen north. It was rainy and the road salt was washed off onto the road. My bike got covered with road salt.