So, I bought this elliptical yesterday. Took me 3.5 hours to assemble. One of the bolts fell while connecting upright to main unit. it took me like 1/2 an hour to find it inside being stuck in between internal parts... After I assembled, I went to a local sport store in Texas (Academy) to buy a mat for elliptical. Found there Pro Form 510e which is almost identical to Freemotion 515e (Pro Form is also made by Icon). Quickly checked review for it on my cell, and I'm dissapointed.. It's too late since I aready assembled it and got it to the second floor of my house, but I would not buy if I knew that it's the same Pro Form just rebaged for Costco. Time will tell off course.. if it won't survive next two years I guess I will use Costco's satisfaction policy for refund..