Tension rods, logical idea, never seen before.. and ugly like hell, or do you hide them? All I find quickly is about tension rods for curtains. How common are

Tension rods, logical idea, never seen before.. and ugly like hell, or do you hide them? All I find quickly is about tension rods for curtains. How common are they? Pluses no need to drill and would work for freestanding, more over just securing with screws to wall?