Hi Hardtimedeciding,
The only way to make meaningful comparisons between mattresses is if you know the details of all the layers and then use this as part of a comparison based on all the objective, subjective, and intangible parts of your personal value equation that are most important to you. Part of a retailer’s job is to provide you with this so you don’t have to go searching for it to make comparisons.
Fortunately … a forum search on Estasi (you can just click this) will bring up more posts about it and the specs are listed in post #2 here.
The Healthy Back Embrace Comfort is a fairly basic mattress with 3.5" of 4 lb memory foam over 7.5" of reasonable quality polyfoam (the 1.8 lb polyfoam is on top which is where it should be and the 1.5 lb polyfoam is on the bottom where it will be more durable even though it’s lower density) and would be reasonable (but not the best) value as long as your body type was suitable for 4 lb memory foam. I would tend towards 5 lb memory foam or at least thinner layers of 4 lb memory foam if you were in the 200 lb range or higher but I would have a particularly hard time justifying the Estasi unless there was a particularly compelling reason that justified the cost based on your specific personal criteria.
Phoenix