I worked for a pool company for several years and would advise against any salt water system especially Hayward. Hayward is the economy brand in pool equipment. The company I worked for would install them if customers specifically requested them, but we would try to talk them out of it. All a salt water system does is take the salt (Sodium-chloride) and separate it using a very expensive piece of equipment. So you still end up with chlorine, or the chloride part of the salt. The fancy piece of equipment that does not last forever and is very expensive when it breaks. Like mentioned above, you have to have the pool Ph just right for the thing to work. In Houston, our PH runs naturally high so customers would have to add acid weekly. The big "selling" point of the salt water systems is that you dont get the chlorine smell or burn, but this is kinda miss leading. If your using a traditional chlorine pool and you smell chlorine then there is a problem with your water chemistry. A properly balanced pool will not have this problem. Saltwater systems have been around for awhile, but seem to be the latest "fad".
Disclaimer: My pool experience is all limited to the SE Houston Area. Pools and their chemistry/maintenance can be very regional.