Maybe you're right about the Canadian models. I know for 2006 they had some updates... Ozonator/New Colours/Colour LED light and spa seat for the 6 man version. I was also told that there was no need to get any extra covers for the winter and it would still be under warranty. Underneath does have some sort of foam pad that is built into the unit, not sure if this is the option for the stateside models.

Derek, have you thought of going to a bromine floater, its great that on the days you dont use it you dont have to worry about it, just keep the floater filled.