I am really pleased with the design of this bike - for example, the double support for the back rest and the seat adjustment knob. I am also impressed with the clarity of the owner's manual - detailed and in plain language and so assembly is as straight-forward as possible. Parts and bolts, etc. are clearly identified. When I needed some assembly help it was very easy to contact Customer Service for suggestions/advice; for example, if the holes on the back cushion don't exactly line up, then loosen the bolts holding the seat to the frame (bolt # 49), attach the back cushion, and then tighten #49s. Of course, the actual construction of the bike is very good. The tension control seems to work as designed and, so far, overall use seems exactly as expected. I'm very pleased with this product and will look for a Stamina elliptical bike for our daughter.