salt water hot tub

They have a deal on salt water hot tub. 

According to the sales person, I don't need to handle PH level, adding chlorine or even changing water due to sodium level they maintain. (Just need to clean filter every month? and maybe change the water once or twice per year).

I always consider 40% of what sales person say, matches the actual performance. Do you guys see the benefit outperform the 2~3k price difference? 

(More buoyancy was very tempting for myself though)