Hi pinupchick,
The specs are a little incomplete and will need someone to call the factory to find out what they are. The support system is fine (as long as it meets your support needs based on your testing) but the weak link of a mattress is almost always in the comfort layers and this is where knowing the quality of the foams used (especially polyfoam) is most important.
5 lb memory foam is good quality.
A heavyweight fiberflex insulator over the springs is also good (it insulates the springs from the foam so that the foam doesn’t sink into the springs and evens out the compression of the springs).
The 2" High Density Soy Based foam is the one I would be most concerned about. This is polyfoam and knowing the density would be important to know. Lower quality polyfoam in the upper layers of a mattress is the most common reason for soft spots and impressions in the mattress. It’s only 2" which is less than many but I would still want to know the density of the polyfoam.
The fiber in the quilting is probably polyester and if this is too thick it will also compress over time and can lead to impressions. It’s there to create some surface softness and breathability but fibers tend to compress and become firmer over time.
So it has some possibilities but the density of the polyfoam and the thickness of the synthetic fiber would be the possible weak link of this mattress.
You’ve probably seen this but some of the better choices I’m aware of in the Greater Toronto area are in post #1 here.
Phoenix