I am very disappointed with my purchase. When I purchased this item, I expected a mid grade elliptical. I figured it would be better than the cheap $199.00 ones out there, but I would have faired better by purchasing a cheap one and saving myself $300.00. The machine shakes, squeaks and make all kinds of noises. My husband has tightened and retightened every nut and bolt, but still nothing helps, it seems like the pieces just don't fit properly together. To make matters worse, it doesn't have a power adaptor and requires 4 double D batteries to power it. Well, that would be okay, if the batteries lasted longer than one work out. After burning through 8 batteries in no time, I decided to purchase the power adaptor for an additional $20.00. I am trying to make the best of my purchase, and wish I had the desire to take it apart and return it, but since it took two hours to put together, it really doesn't seem worth it to go through all the hassel.