Thats wonderful to hear. Caldera has a good reputation and having confidence that both the company and the product stand the test of time is important.
Saltwater systems, like anythings, are subjective to each person. The upfront cost is more expensive than a tradition spa but if used correctly can save you a lot over the years on both product and time. My understanding the initial set up take a few days but once you get to you are good.
The process, as I understand it, you add salt (not table salt) through the process of electrolysis the NaCl molecule is split leaving the Cl ion in solution. From what I read normal spa chlorine also contains stabilizers so the salt system reduce the amount of chemicals in the water.
The water in these systems are softer and do not have the smell associated with traditional spas. For people with sensitive skin it could be a plus.
Some spas can be converted with an aftermarket product. I would talk to your local caldera dealer first. it is also important to look at dates while researching. An article from 2005 might not be accurate now. I hope that help answer some of your question. Hopefully we get more input from others too