Once assembled, these panels are pulled taught and professional looking. The legs make a stable base, although you must be aware that the legs may create a tripping hazard, or take up unanticipated space, depending on your situation. 
I am working that out in once instance where I am using the panels to create little "treatment rooms," placing a finial on the bottom of the leg, of the leg that is not against the wall. The leg against the wall has its stable broad leg on. This makes the whole think a bit unstable.
In the other instance where I am using the three-panel, it is free standing in the middle of a room; I have a bench on one side and a shelf on the other side, and a plant at the end to keep a person from tripping, and it is quite perfect. It is best in a situation where legs that stick out are not going to be a problem.