I bought this recently.  It appeared to be a new selection, one that is greatly welcomed!  It is very quiet and switches from intake to exhaust very easily.  If I were to ask for more I would ask for it to draw more air and for a smaller width.  (This only fits in one of my windows on the ground floor so I cannot leave it installed.)  But very pleased with it.  The extenders are included in the box with the fan.  That was unclear when I bought it.