If we could expand this just slightly... There was some disagreement expressed in a recent thread as to whether an over-sized salt cell was a wise investment for a pool owner. Most of those posting seemed to have adopted the view that a cell's useful life is correlated to amps applied and the area of cell plating, but have discounted (or are unaware) of the notion that friction from turbulent water has any significant erosive action on the metal elements.
I've seen this controversy brought up more than once since I've been on the forum, so it doesn't seem as though it has been resolved to the satisfaction of all players -- if it's ever possible to get consensus on something like this.
Jason sent me a link to a technical discussion with Valera Orlingis that took place in 2007 that may be useful as a reference. I managed to get though about half of it last night...