We bought & installed two of these.  My husband, who knows quite a bit about all things mechanical & electrical, was very impressed with the construction.  The box came with extra screws, weights for balancing the blades (not needed - it balanced perfectly from the outset) and "feet" on the motor which served to make it more manageable to put together (they are then discarded).  Someone gave a lot of thought to making the instructions for assembly as customer friendly as possible.  The humidity protection is also very well thought out.  Plus - they look fantastic.  Clean, modern lines - and everything works as advertised.