Easy to build. Stable when finished due to the square metal bars incorporated in the resin structure. The roof went up easily but time consuming getting all the edges of the walls slotted into the frame of the roof but when done is a very well made roofing structure. Proven to be waterproof as it has rained for 3 days since installation. The floor is of a hollow manufacture suitable for light use and could be pierced with sharp or pointed items. I have fitted a 9mm ply floor over the plastic for protection and ability to fit racks and bench without squashing the supplied floor. Very pleased with the maintenance free shed and feel its value for money.