Having read all the reviews about the one-stop type stools, I decided the get something taller for our 2 year old grandson, as he will soon be beginning his toilet training. This is just the right height for him to wash his hands (which has now become a game) and he can lift it and move it about himself. The steps don't actually have any real non-slip matting, more just a bumpy surface and the lower step isn't big enough to turn round on, so he ether has to come down backwards or turn on the top step, but I supervise anyway, but it's nice and stable and it's plenty high enough for him at 2 years.
Revised: Lower step being so shallow proved did prove a hazard and the not so 'non-slip' surfaces meant slippage when wearing socks, so sent it back! Bought a RSW 2 step stool - does the same job, half the price and one of those little collapsible ones for upstairs.