We had a swimming pool put in 3 years ago with a salt water chlorination system. The upside is that the pool water feels a lot better with no chlorine smell and cleaner skin after swimming. Maintenance however is a problem.
Tucson has hard water, and the scale eventually clogs the chlorine generator. To fix this, you have to put the chlorine generator cell in a Muriatic acid solution to etch away the scale. However, as the system ages, this process has to be done more frequently and eventually the cell has to be replaced. At ~$700 this is not a trivial expense.
The other problem is that the salt water causes the Kool Deck to have cracks and chips. The rep. at Mortex Manufacturing (makers of Kool Deck) said that its not the Kool Deck that is affected but the concrete underneath and that there is not much can be done other than rinsing the deck after swimming and doing periodic repairs on the deck.
So when getting a salt water system installed, be aware of the extra maintenance for both the Kool Deck and the salt water cell.