The Sena case has more protection than my old cover and offers far better usefulness then the Axim slipcase. I am not going to test this out, but given the padding of leather on the front and the back, it is my belief that it will drop only on those sides and not on it's side. This is true for a cat that always lands feet down, and a slice of bread always lands butter side down.
Actually the front flap does overlap enough that it would help in a fall, and the top is well covered, so the chances are only 1 out of 4 a dropped Ax will land on its less protected bottom!