We have another Lucid mattress and love it, so decided to purchase this one.  Lives up to being a true “medium” for firmness... I was expecting it to be more firm based on the other reviews, but it is a true medium.  Off-gassing occurred for first twelve hours and then was unnoticeable after that.  Can’t beat it for the price!  I would rate as comparable to a CasperPurple (although it has less of a warrantyguaranty) at a fraction of the price.