Hi ghifai,
The Sacramento list is in post #2 here but there isn’t a lot right in the area as you mentioned. Diamond mattresses can have some good value (depending on the retailer that sellls them) and I think highly of the Berkeley Ergonomic mattresses as well and they are also good quality and value.
Yes … I agree with your thoughts and I have always been impressed as well in my conversations with them. A forum search on Berkeley Ergonomics (you can just click this) will bring up lots more information and feedback about them.
They certainly use good quality materials which along with my personal testing would be much more important than any reviews (except for reviews on the retailer I was buying from). I also think an innerspring/latex hybrid can make a very good choice (like the Berkeley ergonomics which use very high quality springs).
I think not being able to ty it and the fact that it can’t be returned was the biggest “worry” of most of the people who have purchased this as well but the tradeoff for this is that they have great value and they are also good at helping their customers make their firmness choices. They also have a Eurotop model where you can exchange the layer for a reasonable cost if you make the wrong choice initially which can also offset some of the risk but it’s a little more costly.
I think you are looking at good quality choices and once you have eliminated the worst choices and are comparing “good to good” (which you are) then your choices will usually boil down to personal preferences and the objective, subjective, and intangible differences between them and how they fit your “value equation” (although I can’t really assess the value of the Diamond because it would depend on which mattress you were looking at and the prices charged by the retailer).
I don’t really think you can make a quality or value “mistake” at this point and the real issue is your confidence in how well each will match your needs and preferences and how comfortable you are with the extra risk of ordering online vs local testing.
Phoenix