Hi gusbuf,
I’m looking forward to finding out how the topper works for you.
I would also make sure that you find out the information listed here about all the foam layers in the Lull mattress before deciding to keep it so that you can confirm that there aren’t any lower quality materials or weak links that could compromise the durability and useful life of the mattress over the longer term regardless of whether it may work well for you in the shorter term (although they may not be willing to provide it to you … see this topic). I wouldn’t purchase or keep any mattress where you aren’t able to verify the quality/density and durability of the materials inside it.
Phoenix