Leaving from conservation hut, my kids convinced me to do the 1.5 hour 'hard' walk, rather than the 3hour 'medium'.
Downward descent was fine for the first half, though the stone stairs are uneven and can be slippery in the second half. However, one at the falls you are rewarded with some really beautiful vistas. Viewing of the falls is possible on many different levels as well. We descended with the falls to four different viewing points, but I think it may have even gone further into the valley.
The walk up is hard for anyone who doesn't do aerobic and leg workouts daily, and it was at this point that I really wishes for an inclinator that I could step into and be jettisoned upwards. Only problem with that would be that I couldn't boast about having done the climb afterwards.