until now! We like it. Im 220, leg lift 100 and there is not even a hint of instability. Nice slipper for the money. I was in a dark place but music brought me out of it and this thing sounds so good and is so easy to use and is so portable and lasts so long, now I start every day dancing and laughing! I have them in every color, and I regularly get compliments on them and questions about them from strangers on the street. It said that the serial couldnt be found so I called customer service. As for the color, its on point. It did not matter what type of surface - carpet or wood flooring. ? He likes how much they block out other sound.