there are soo many products out there now that actually makes crown applications very simple. There is a product out now that is just corners both inside and outside. Each piece is about one foot on each side, you attach the corners both inside and outside and the compound mitre is cut for you all you have to do is to splice the corners with long pieces and join up and caulk and walla. the joining pieces are not compound cuts just single angle butt joints.
The down side is that you are required to use the kits crown configuration.
I have not seen your product in mention, will check it out for sure.
Crown is the most beneficial amenity that can be added to a room or interior that can make the room a complete change, especially if the use of accent painting is used.