This is not a cheap step type ladder that you see in hardware stores for a cheap price.  Firstly, they are hardly ever rated above 90kg.  This unit is conservatively rated at 150kg.  It has double cantilever construction with double reinforcing bars.  It is very, very sturdy and stable when deployed.  If you are a person of nervous disposition when standing one of these devices, you should be ok on this one.  Try it at home and bring it back if you are not satisfied.

Each tread measures a generous 330w x 210 and has a heavy duty non-slip rubber tread.  The step is 380mm high when fully opened.  The frame is aluminium and the steps are powder coated steel.