Using the remote control, you can raise and lower the lawn mower deck. In this video, the mower cuts grass both normal grass height and big brush. You will see it go up a pretty steep hill and back down. It pauses a few seconds when stationary, two different times to change the height of the mower deck to adapt to the grass or brush.
You can cut both tall and low grass and traverse steep hills. Try doing this with a regular mower without fear of falling down or tipping over.