Hi pdunc,
It uses high quality and durable materials and components and there are no lower quality materials or weak links that would compromise the durability or useful life of the mattress so if it’s a good match for you in terms of comfort, firmness, and PPP it would certainly be well worth considering.
Yes. A two sided mattress that is rotated and flipped on a regular basis will certainly last longer than a one sided mattress that uses the same comfort layers on one side of the innerspring. There is more about the pros and cons of one sided vs two sided mattresses in post #3 here.
Phoenix