Okay, so they didn't really have any answers for me as to why they suggest lithium over bromine. So, I did what you wise people suggested, and went with what they suggested for now. I'm glad to hear that some other people on here have used it with success.
The lithium gives off a much different smell, that has so far, caused me to cough while in the tub with the jets going, but I suppose I may get used to it.
The important thing is, that after waiting 14 weeks for delivery (but that's a whole other dealer issue), our tub is installed, and feels wonderful!! We got the 60 jet platinum series tub, and every seat does a different job. It's fantastic!!
So far, I find the cover lifter a complete waste. I'm glad we went for the undermount, instead of the side mount, so I don't have holes in the side of the tub when we remove it.