The term "saltwater pool" is a bit misleading.
I was a builder in TX. and 95% of my pools had that system.
Simply put, adding a chlorine generator is just that.
A system to generate chlorine, from sodium chloride (salt).
The system changes the salt you've added to your pool water into a chlorine gas and eliminates the need for you to add chlorine maunally.
Benifits: After the overall cost of the system (size of the unit is based on total gallons)salt is pretty darn cheap. A lot less than chlorine tabs or powder, so you'll save some money. Chlorine is caustic and a carcinogen. Totally unsafe.
"Chlorine tanks ruptured after train wreck" "Towns evacuated, people suffer burns"
Salt on the other hand, is sitting in your kitchen.
(Same as pool salt but iodine has beed added).
The chlorine gas entering your pool does not produce chlorimines which cause burning eyes, itchy skin, yellow hair and bleached out bathing suits.
Disadvantages? Well if you add to much salt into the pool, you will taste it.
If added properly there will be no taste involved and most systems have an "add salt" light and a "correct range" setting in PPM.
Simply put...........add the system, with self reversing polarity (self cleaning).
Most systems are guaranteed for at least 5 years.
The sun will deterioate your liner more that the chlorine will if used properly.
Remember, all your doing is producing your own chlorine instead of buying it.