Hi mideastprincess,
You can see a few comments about the Dormeo Octaspring in post #2 of this thread and a forum search on Octaspring and on Dormeo (you can just click the links) will bring up a more comments about them as well.
They are transparent about their materials and as an example the 9500 model is made up as follows …
2" 3 lb memory foam
3" 5 lb memory foam ecocell
2" 2.5 - 3.5 lb polyfoam ecocell
2" 3.5 lb ecocell zoned
2" 2.5 lb ecocell
NOTE: post #33 here has the updated specs for the Octaspring line (excluding foam densities) and they also now have two new lines besides the Octaspring called the Dolce and the Serenite (which includes Talalay latex instead of memory foam for the top layer).
My biggest concern would be the top layer of memory foam in their mattresses which is lower quality (less than 4 lbs) but all the rest of the materials are good quality. 2" is a little over the thickness I would normally suggest avoiding for lower quality materials in the upper layers (around an inch or so) and once there is 2" or more of lower density materials this could start becoming a weak link in the mattress … but it’s not a lot over the guideline so this isn’t as bad as a mattress that say uses 3" of lower quality memory foam which would have a bigger effect on the loss of comfort and support and the long term durability of the mattress.
From a “commodity value” point of view they are not particularly good value and there is more lower quality memory foam in the top layer than I would be comfortable with (see post #4 here) but they are also a unique design and the pressure relief/comfort and the support/alignment of a mattress may also be important part of each person’s personal value equation that for a few people may offset the higher prices or the possible weak link in terms of durability because of the 2" of 3 lb memory foam. ADDITIONAL NOTE: Their new line has apparently reduced the top memory foam layer to 1.5" which is better and is more in line with the guidelines here of “no more than about an inch or so” of lower quality/density materials in the comfort layers that I would normally suggest.
If for some reason this mattress was so much better than other choices you had in terms of feel and performance or PPP (Posture and alignment, Pressure relief, and Personal preferences) that nothing else would do or even come close, then in spite of its higher prices, and as long as you were OK with a little more lower quality memory foam in the top layer than may be ideal or desirable … then it may be worth considering for those where a unique mattress that seemed to feel and perform so much better than anything else they tested was the most important part of their criteria. It’s “value” in other words would be more in its uniqueness and whether it was so much better by your specific criteria that the higher price was justified and “value” by more typical definitions wasn’t as important to you.
Phoenix