You mentioned Arctic Cub. I have an Arctic Yukon (same model as the Cub, but no lounger) , and had the salt generator system. The cost of the cells PLUS Blue Falls cutting the warranty time on them, had me shut off the Onzen and go to chemicals.
I likely don't use $100 (US) per year in chloronating concentrate, Ph booster, Calcium booster, etc. and Spa Sentry on water changes, and test strips.
Water is fine. Ya gotta check the readings ANYWAY... and it's nothing to throw a capful of this or that in when it's necessary.
Of course, it's almost always just the two of us and no bathing suits permitted at any time, so that keeps the water clean.