For years I"ve used all versions of AB Wheels from the cheap ones (which were fine at the time) to the ones that look like amoebas with wheels but I discovered this wheel at a new Crunch Fitness club and if there ever was an improvement in the design of a simple contraption like an Ab Wheel, Throwdown HAS done it! It's sturdier, smoother and breeze to use. I don't know why I'm describing a simple device like this as better but try it once and you'll understand why I'm taking the time to applaud it. I can do 3X the number of sets on this wheel as I've done on any other its like a hot knife thru butter, it makes the whole crunch exercise easier and you want to do more.