Arrived in a box that has clearly been opened before... used product. Missing all its screws and only had washers and band. Unable to assemble... Delivery was late (although that is a separate Amazon Prime problem). Returned unusable/ unable to assemble product the next day. Reordered replacement of same product. Will update review... maybe was just a defective product... if they send me another used product, I'm guessing its a supply thing and they're trying to pass this stuff off as new... Will have to try a different roller...Update: Got second replacement order. All parts present this time (including screws). Assembled just fine. Looks new. Has some grease on the rollers which is interesting but I'm assuming during the manufacturing process, wiped off. Not sure if I'm sized correctly but initial attempt there is enough resistance to cycle. Worried more about riding forward off the tacx then falling sideways but that may be a sizing issue. Overall feels good. Slightly louder than I was expecting. Will update with results.Update 2:Sized correctly works fine. My large trek bike is at the upper limit on button 1 but it works great. Higher resistance than i expected. Much louder than I expected. Wondering if aluminum would be quieter but the roller works just fine. Seems sturdy enough. Able to get a good workout. Don't have anything else to compare to though. Not convinced the parabolic roller shape is the best but the thing works just fine for me. So updating to 5 stars.