Sorry for the long post.  I've been reading on this forum regarding mattresses for a few days.  I've come to the conclusion I don't want memory foam, I'm a warm sleeper and don't like the sinking feeling and most are made with regular base foam.  Also don't want a inner spring after the Sealy we had been using.  So I'm leaning towards latex.  We have a king platform bed with plywood base.  I'm trying to decide if I should build my own from FMB or go with the Costco S&F Madeline king mattress set for $1800.  My main concern with building my own is basically no warranty as it will be impossible to get it replaced from an online company where as Costco is a breeze to deal with.  I just don't want to be stuck with a $1000 sagging mattress 2 years later. 

So those that have the latex from FMB, how long have you had it for and how has it held up so far?

Will probably cost around $1000 from FMB to make a similar mattress with all the layers and covers, but would it be comprable, better or worse?

Is there better/cheaper source for latex than FMB?

Anyone have reviews on the Costco mattress?

Costco S&F specs:

1.3 oz. FlameGuard™ CashmereFiber

1 ½” x ½” Convoluted SuperSoft Flawless Foam

2 Layers of ½” SuperSoft Flawless Foam

1” x ½” Convoluted Latex

½” SuperSoft Flawless Foam

1 ½” x ½” Convoluted Memory Foam

1” SuperSoft Flawless Foam

1” Memory Foam

8 ¾” Luxury Latex Core

Thanks for the input.