durable and works as advertised.  I've used my first one for almost a year, bought a second one recently so I can work on both legs at once.  If you tie one at a bedpost and tie the other end to your legs/arms (just pull the band through one of the handles  so your foot is caught in between), you can work on adductors/abductors, hip ROM, etc.  Wear a sock/long pants so it doesn't chafe your skin.