I was quoted $2130 plus labor of about $400 to replace my existing Aqua Rite panel and salt cell with the Aqua Rite AQR940. (Over $2500 total, and that's for a replacement not a new install.) Compared to an AQR15 at about $1800 plus about $400 labor, a savings of $300. What would I get for the $300 difference? Just a cell with a 1-year longer warranty? Is the panel different on the AQR940 or is the panel exactly the same on both models? (Summer 2022 for reference.)