Hi Bazainga,
Hopefully dn or any of the other forum members that have experimented with zoning will see your post and share their comments as well.
I would keep in mind to be somewhat cautious about using other people’s experiences on a mattress (either positive or negative) or a particular zoning system as a reliable source of information or guidance about how suitable a mattress may be for you and in many cases they can be more misleading than helpful because a mattress or zoning system that may be a perfect choice for one person in terms of PPP (Posture and alignment, Pressure relief, and Personal preferences) may be completely unsuitable for someone else with a different body type, sleeping position, or preferences and sensitivities to sleep on (see post #13 here).
There is also more information about zoning in post #11 here and the posts it links to that may be helpful as well.
Phoenix