I can't say enough about the treadmill.  My husband and I really love the way it works, easy to use and get a work out at the same time.  Easy on the knees, but does what it is supposed to, work us out.  Being able to set the speed helps both of us, we can adjust for the way each of us wants to use it.  Quiet so that you can watch tv or listen to music while you are working out.  Does not interfere with someone else if they are in the room at the same time.  Rolls easily so it can be moved to one side of the room or the other.  When you are using it, you do not even know that you are working...