Another vote here to stay away from the ionizer. It's pretty much snake oil IMO. Stick with the SWCG or manually chlorinate with plain bleach.

Our pool was installed in March 2004 and has been a salt pool (w/Aqua Rite SWCG) from day one. None of that site's scary warnings have been true in my case. What will cause problems is not keeping the water properly balanced no matter what method of sanitation you use.