Hi ydelle,
In order to make any meaningful evaluation of a mattress you need to find out (from talking to Ken Michaels) the specific details of every layer and component of a mattress. They should provide this for you. The description you provided is just a general website description and not nearly detailed enough to evaluate the mattress or compare it to other mattresses.
I would start with post #1 here which has the basic information, steps, and guidelines that will help you make the best possible choices … including how to test a mattress more objectively (and I would certainly wear loose clothing but not my pyjamas :)).
Reading reviews is not really mattress research and won’t give you any particularly meaningful information about mattresses you are considering although it may give you some information about the service of different retailers or manufacturers (see post $13 here for more about reviews).
Phoenix