So far....
We love our new king sized Genius. We both have back and joint issues. So far we have not experienced the mattress heating up, unpleasant odors, sinking in of the mattress, or anything else negative. We are both 'plus sized' people and my husband is always warm. The salesman did tell us that the storage of the mattresses can cause the odors and sinking in of mattresses. He said it depends on whether or not the are stored laying flat or standing upright will determine if there is off gassing. Warehouse handling can affect whether or not it will sink in in spots too, he said. All I know is that we LOVE our Genius. Lest I forget, he threw in two free scrunch pillows! They are WONDERFUL!! We both snore, but much less since using these fantastic pillows. The only reason we both know this is because he got up to let the dog out and had to check to see if I was ok...wasn't snoring loudly! He used to wake himself up snoring...Sleeps through the night with no neck or back pain and minimal snoring. Best purchase we have made in 20 yrs of marriage! This review is for Serta iComfort Genius