This flex edge beater is a definite must have for any KitchenAid owner.  I have a very old professional model from my grandmother and was initially worried that it wouldn’t fit but it works so well!  It perfectly scrapes the sides of the bowl as it mixes to make sure everything is incorporated.  Also, I love the fact that there are no interior pieces to the design which makes it so much easier to clean.  Would definitely recommend this!!