i have been reading for a long time and am more confused than ever. a basic question i have. if i try out a local mattress that has 3x3" layers of 100% natural dunlop with ild of 19; 26 and 36 (top to bottom) and cover x, if i purchase online the same config with the same cover x is this, without going into too much detail, more or less the same mattress? cost is high in my value equation and i can get better pricing online but am not willing to buy (hence my paralysis) without first testing locally. i did read the article related to compression modulus etc. so do i need to factor those things in. i am ver simple and am trying as best i can to say the following; i tested mattress x locally and mattress y online will be similar so in confidence i can buy the mattress online. thanks as always