Hi AndrewR,
If you can find out and post the information listed here about any mattress you are considering I’d be happy to make some comments about the quality and durability of the materials and the mattress “as a whole” or let you know if I can see any “seak links” in the design. Without this information it’s not possible for me to make any meaningful comments about the quality and durability of any mattress. Based on my experience … the original mattress factory is transparent about the materials in their mattresses although an employee would need to be willing to take the time to check their spec book to provide you with the information you need and some of their employees may be more or less willing to do this than others.
If the mattress is a good “match” for you in terms of PPP then the coil count would be fine and I would be very cautious about using coil counting as a way to compare mattresses in the first place since it usually isn’t a reliable way to assess the durability of an innerspring or a mattress that uses them … especially when you may be comparing different types of coils that use different types of construction and designs. There is more about “coil counting” and comparing innersprings in this article and in post #10 here. The 1100 coil count you are referring to may also be a microcoil that is used as a comfort layer which is very different from the types of springs that are used for the support cores in a mattress.
While 1.5 lb polyfoam would be a suitable minimum density for comfort layers in a two sided mattress and I believe that you are correct that many of the OMF mattresses use a minimum of 1.5 lb polyfoam in their two sided mattresses … I would always check to make sure that you have all the information you need to make an informed choice before making any mattress purchase and I wouldn’t rely on any “second hand” information that doesn’t come from the manufacturer or retailer themselves so that you can confirm that a specific mattress you are considering meets the guidelines here … especially since manufacturers can sometimes change the specs of their mattresses from time to time.
OMF in general makes some good quality/value mattresses that I would certainly consider as a good quality/value purchase but I would be very cautious about “brand shopping” because in terms of quality and durability any specific mattress is only as good as its construction and the quality and durability of the materials inside it regardless of the name of the manufacturer on the label.
Phoenix