Actually previous generation of ipphones were much more user friendly, the new series 7811-7821-7841 does not support dial auto complete which was a great feature in 7911 - 7942. In addition as a user point of view working with the circle in middle of phone is not a good experience for female users after a while they will face problem in pressing the circle bottom cause they usually use cosmetics like hydrating cream on their hands! the other point is managing the height of ip phones which is not adjustable. hope in next generations solved if ip phones exists!