Hi johnkeith,
A zoning system can be helpful with alignment because it provides different levels of support under different parts of the body. It can be especially valuable for those who are more “difficult to fit” because of unusual body types such as more athletic builds, body types that have a wider gap between the waist and hips or waist and shoulders, or weight distributions that are unusual. they can also be helpful for those who are very sensitive and are more on the “princess and the pea” end of the scale than the “I can sleep on anything” end of the scale. There is more about zoning in this article and in post #11 here.
The advantage of the vZone system is that the zones can be customized or changed so they can be personalized for each person.
Phoenix