It's stable, fully adjustable, and it can take a lot of beating without a trace. A must have, whether you are a beginner or already a seasoned player.
Made for duration and stability, the rubber "legs" protect from sliding on any surface, except ice - we didn't test it on ice. It was tested however on lacquered wooden floors, marble, plastic (linoleum), carpets, asphalt.
Trully a recommendable product!
(*) Except for the one on the left of the brake in a Corvette