I installed a SWCG on our pool about a year ago, and really like it overall. There are some downsides to consider that may lead you to other options. First, apparently salt can have deleterious effects on some stones. I have not seen this yet, but again, this has only been in place on our pool for about a year. Second, an SWCG will not control pH, and you may likely find that the benefit of not having to manually chlorinate your pool is offset to some extent by rising pH requiring weekly (or more often) muriatic acid additions. In our case, this was particularly evident when we first switched over from liquid chlorine to the SWCG. You will need to make efforts to reduce the total alkalinity, but regular acid additions will be necessary. Third, if your water temp drops below about 59 degrees F, which I would bet it likely does in Melbourne, the SWCG will become less efficient in chlorine generation. In my case, the generator shuts itself off when it gets below 59 to prevent any damage to the unit. Thus, for the several months during the year when the water temp is below its operating range, the SWCG is useless. This caveat is itself offset by the fact that the pool does not consume nearly as much chlorine at low water temps, especially if you have enough CYA to protect the chlorine from UV. As others have mentioned, a fourth issue is that the cells themselves degrade over time and need to be replaced... these are not cheap.
So, these are important issues to keep in mind. Salt systems are great, but they are not perfect. An alternative that might be of greater utility would be something like Pentair's Intellichem, which uses dosing pumps to feed chlorine and/or acid based on continuous reading of oxidation/reduction potential (ORP) and pH, respectively. These are a bit more expensive in the short run, and their long-term reliability remains to be seen (at least with the Pentair units).
