Hi Sheepcounter,
My comments were based on the price you paid and if you purchased your mattress from Sleepy’s for $600 then it wouldn’t be reasonable to expect that it was new and something certainly isn’t adding up.
“Enough” is relative to whether the materials perform the functions you are looking for “well enough for you” so this is something that I really can’t answer. It would depend on how well the mattress matched your criteria in terms of PPP (Posture and alignment, Pressure relief, and Personal preferences) and the other parts of your personal value equation that are important to you.
Phoenix