Mattress Forum

I've been looking at the split layers (one firmness side for each person) and zoned systems (head to toe firmness differences) and I am curious if any of you can share any insight.  My questions are below:

1)  For the different firmness for each person, the latex needs to be split into two pieces - left side and right side.  Are there problems with one edge rubbing up against the other edge and creating a bump in the middle of the bed?  Any other potential issues?  Or does it seem to work without any issues.

2)  Does having three layers (stacked on top of each other) cause any issues as well, such as shifting, rubbing, etc etc?  Does it matter if I have to put the soft side on the bottom (If the exhange period is over and I need a firmer bed for instance)?

3)  Does anyone have any experience with the zones (diffenrent firmness from head to toe) and is it worth it at all?  Meaning is it just another gimmick or does it really make a difference.

4)  Would stacking Dunlop on bottom and Talalay on top help for a larger person because Dunlop is more dense and might prevent bottoming out?  This question is not for me but I maybe recommending latex for somebody.

Any thoughts (regardless of if you have actual experience) would be helpful.

Thanks in advance.  I have alot more questions but I'll post separately.