Lennox FlexZone

I am getting estimates for a new air handler for my heat pump. One of the contractors suggested a FlexZone to handle the 9 temperature variance between floors during heating season. I am considering it because the air handler itself costs a fortune and I figure if I'm spending that much the system should do what I want. Does anyone have any opinions on the FlexZone? Also, is the PMAC-12 media air cleaner worthwhile?
More questions to follow.
Mike snipped-for-privacy@onuj.com (reverse domain)
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