I was very disappointed in the craftsmanship of this Treadmill. When I opened the box, several screws fell out immediately. There were 3 screws missing overall, and 2 of the major assembly bolts were the wrong size. We had to go to the hardware store twice to get the right sizes and replace the missing pieces. The frame itself was sodered together incorrectly and one piece still keeps falling off. The concept is good and if these errors hadn't occurred, it would have been easy to assemble. There is no excuse for such poor workmanship. Would have returned it but it weighs a ton and shipping would have been a fortune!