The bed frame itself and operation etc.. I would give a 5 - it is well made works great.  The mattress itself I am not completely sold on yet, seems to be taking us awhile to get used to.  I find it too hot, it's fairly comfortable you sink in conforms to your body, but is also firm.  We have a split king and the mattresses did not fully puff up at one end of the bed just ever so slightly different, but do-able. Therefore mattress rate 3