I have researched and considered, which elliptical machine should be long before my purchase decision. Main concern for me was that the device is working as quietly as possible and a flywheel mass of min. 18 kg. My limit was 600 euros and I had been looking specifically for reduced equipment to this, a good elliptical machine still low price to get a reasonable quality. I then ordered the Jupiter at MaxTrader. First I called the customer service and tipped the ball to ultimate questions. For the friendliness of customer service ever perfect score. When the unit arrived, was eigtl. Planned to build it together with my husband, but I did not wait, and so I've assembled the part itself. Is a bit lengthy as a couple, but it works! Except for a small thing, but where it was due to my lack of imagination and therefore I lost some time, I could build everything easily. The assembly instructions are extremely, if you sort all parts and numbered, as specified in the manual, which helps immensely. After assembling then the first test run: pure enthusiasm, how quiet the elliptical machine is running. So I might as well make a workout at three (theoretically, who wants that ;-)) without disturbing JMD.. A creak as described by the previous speaker, I can not confirm absolutely, everything runs smoothly and silently. I am completely satisfied. If I have concerns me a little closer with the programs, I will add a few details about it here. For this price, an absolute recommendation - and, incidentally, much more stable and better processed as a price similar model of Christopeit!