I have one of these permanently situated behind a door in my kitchen, where it has proven very useful to gain access to the tops of kitchen cupboards for cleaning/replacing light bulbs. I have even used them when decorating.
The steps fold up so that they occupy an incredibly small amount of space, so they are very useful if space is at a premium. They also feel very sturdy. As they are so compact, you are also in no danger of damaging walls by carrying them around should the need arise. There is a carrying handle built in to the back of the top step.
I do not like using ladders due to an accident I had in childhood, but I feel very safe using these steps.