Hi tarpon,
There are only two ways to know how a mattress is likely to work or feel for you. One is your own personal testing and experience on a mattress (or a very similar design) and the other is more detailed conversations with a knowledgeable and experienced online retailer or manufacturer. They are the “experts” about their own mattresses and are always the best source of guidance (see mattress firmness/comfort levels in post #2 here).
They will tell you when you talk with them which one is more accurate for the majority of people (keeping in mind that a group of people will always have a range of experiences on the same mattress) but I would suggest that the description on their site (comparing it to the Contour Rhapsody) would probably be more accurate for most people. Most manufacturers wouldn’t put a free return policy at risk with a description that they didn’t believe was accurate and that most people wouldn’t agree was at least close (in spite of the subjectivity involved).
Again I would make sure you talked with them but I would tend to put more weight on a manufacturer’s description of which mattress it approximates for the same reasons.
I would be very cautious about using mattress reviews or other people’s experiences as an indicator about how a mattress will feel for you (see post #13 here).
Thickness doesn’t mean much at all. It’s the materials inside the mattress and the comfort layers especially that will make the biggest difference in how a mattress “feels” and the thickness is just a side effect of the design.
The memory foam in the mattress is good quality (4 or 5 lbs) but the polyfoam support layers are a little lower density than the other two you are considering. They can be customized but they don’t have a free return policy but once again talking with them is the most reliable way to decide on any mattress that you can’t test in person.
I think that one of the few reasons I would walk through their front door is to test Tempurpedic mattresses if I was using them for a reference point.
You are looking at some good options but with online purchases that are comparisons between “good and good” your confidence in the suitability of a mattress based on conversations with each manufacturer and local testing on mattresses that approximate the ones you are considering along with the parts of your personal value equation that are most important to you (including the price and return policies) will play the biggest role in your final choice.
Phoenix