Easier to put together than my first Cubii-Go model. Wheels are smaller, thinner, cheaper plastic than the first model, or simply cannot take the weight of this heavier unit. They cannot roll at ALL on my short thread carpet, and scratch the hardwood floor so it has to be carried. If you stand it up against the wall, the pedals can fall forward and hit the wall hard enough to scratch it because the pedal bar isn't secured at one end. If you turn it around, the bars can fall and someone could trip over them. There should be a hook or something at one end to secure before standing it upright. Sound: is not "whisper quiet", there is a constant whirring sound.