The box is heavy. The main part of the bike is heavy and sturdy and already put together. There are many parts, BUT the screws, nuts and bolts are already where they should be. No hunting for screw A to put into hole Z. Just take the the screws out, put the part in place and put the sceew back in place. You may need a little working knowledge of a bicycle to put the pedals on. But overall, most of the parts only fit in one place and one way. I used the instructions, but not the video. It is sturdy to ride, but when the seat is raised to maximum height, the seat is a liitle wobbly. I am 6' 2" with a 32" inseam. With the seat at full height, my knee is slightly bent with my leg fully extended. Putting your feet into the straps of the pedals take some getting use to. I like them because you transfer power from your legs to the pedals for the full pedal stroke. The handles are a little awkward when the tablet holder is installed. The bike is fairly quiet when riding. I will update as I ride more.