I just happen to own one of those units.
I bought it to mow around a pond with. It comes with a heavy spring so that the mowing head will swing back and mow around the fence posts. This doesn't work well for mowing around a pond where you have high grass.
I finally got smart and put a solid chain in place of the spring and it works great. The frogs don't like it much though. /forums/images/graemlins/grin.gif
I would rather have a sickle bar mower to be honest but I don't so I use the Postmaster. /forums/images/graemlins/frown.gif