I am one week into sleeping on my new 16" mattress.  Yes, it is firmer than you would think, but it gives enough to give you a comfortable sleep.  Good for back and side sleepers.  I do not flip and flop like I used to during the night.  Very surprising that it is as comfortable as it is.  I was prepared to spend 2k on a tempur-pedic.  What a nice surprise.  Highly recommended.   If you aren't sleeping well lately and your mattress is around 6+ years old...try this mattress.  It has a 60 day return so you can try it and see if you like it.   Yes, there is a smell when you first get it, but it airs out in a couple of days.