Hi CF,
[quote]We purchased full Beautyrest Allegheny Extra Firm from Sears.
Mattress had definite “valley” on one side, whiche we blamed on delivery.
Sears replaced mattress with same mattress and it had the same defect on the same side.
We went back and paid more for a Stearns & Foster Ultra firm which will be delivered in two days.
I would recommend strongly against purchasing Beautyrest Allegheny Extra Firm.
Perhaps at the end of production of this particular model, they were skimping on materials. [/quote]
It’s possible that the issue you had with sagging was from the foundation or support system under the mattress but I would extend your recommendation to avoid the Beautyrest Allegheny Extra Firm to avoiding all the major brands completely (see the guidelines here) along with any other mattress that uses lower quality and less durable materials or where you aren’t able to find out the quality/density of the materials inside them.
There are too many better quality/value options available to take the risk of purchasing a major brand mattress that includes lower quality and less durable materials that will generally lead to the loss of comfort and/or support and the need to buy a new mattress much too quickly after a purchase relative to the price you paid … and the loss of comfort and support isn’t covered by a warranty (see post #174 here)
Phoenix