Bests & Worsts Reviews from Amazon

After receiving the product, I used for about 3 days under my desk at work. Soon after I noticed my left knee was feeling weak when walking, or climbing stairs. Almost like a strained tendon. Previously, I've never had a knee issue. Therefore, I believe using this product caused harm to my body. Save yourself the money and don't buy! Plus product is super heavy, and screws loosen easily on the mechanisms holding the pedals to the frame. Unfortunately it's too late for me to return and would be super expensive to pay for return shipping due to the hefty weight. :/