BRP is a good design in that there are relatively flat, mulch surfaces where your disc can have a reasonably good chance to stick when you land there. The boulder edges are either good or less than ideal depending on your design goals. They look good aesthetically but produce random kicks for throws good enough to reach the plateaus. Some designers like that flukiness. For those that want less fluky outcomes, consider using a more uniform boundary material such as timbers or bricks, especially if you don't have boulders to start with.