Hi BorderGirl,
While the type of innerspring in a mattress can certainly affect the feel and performance of a mattress … the innerspring isn’t normally the weakest link in a mattress and the durability and useful life of a mattress will depend much more on the quality and durability of the materials or components that are on top of the innerspring (or on both sides in the case of a two sided mattress) than on the innerspring itself. If the innerspring in a mattress is firm enough to keep you in good alignment and a mattress “as a whole” is a good match for you in terms of comfort, firmness, and PPP (Posture and alignment, Pressure relief, and your own Personal preferences) then it’s very unlikely that an innerspring would be an issue in terms of durability.
There is more about the pros and cons of different types of innersprings in this article and in post #10 here.
Original Mattress Factory doesn’t make any pocket coil mattresses.
Most of the mattresses that are sold in the industry today are one sided and can’t be flipped (even if you wanted to) but there are still some two sided mattresses that are available (usually made by smaller manufacturers) including some of the mattresses sold at Original Mattress Factory. There is more about the pros and cons of one sided vs two sided mattresses in post #3 here.
Phoenix