The instructions were limited with typos in the instructions.  The reason for the 3 stars is the toilet seat is not sturdy.  It is impossible to tighten it down so there is no movement from side-to-side as it is mounted on two posts not bolted in.  also super flimsy.  They tell you not to stand on the lid, but I don't think you could even put you hand on it and lean on it without cracking it.  I have never purchased a toilet with a "U" (horseshoe) seat.  it is very narrow on the sides (2 1/4").  It does not feel much different from sitting on the toilet with the seat up (1 1/2").  Our  Standard US toilet seat is 3" on the sides.   The narrow sides make it very comfortable to sit on.  I am stuck with this toilet as it is the only one I can find that is small enough to fit this bathroom.  I wish I could fix the 1963 toilet that I replaced with this one.