Cosatto changing unit is the most straightforward to assemble and took me 30 minutes by myself. Not much of screwing or hammering. There are lots of useful storage compartments but they are a little too small for big items like eczema cream. I like the shape of the bathtub, which is beneath the changing mat, as it allows baby to sit at an angle. As for the bathtub, we didn’t use it as we had the changing unit in our living room. It comes with a comfy, padded and easy to clean changing mat.