firstly, this stool's joint looks very stable. It will me very safe. Also, I can see that the surface is a bit round. I think this will make it comfortable for the user. One thing this stool lacks is that there are no handles to carry the stool.
Description: 2 Ikea Lack Side Tables stacked on top of each other, I used 4 L brackets to attach the two together. Then the small cheap vika amon table top glued on top. Cost me about 25 bucks between the side tables, top and hardware.