We've been using the bed every night for a little over a week. My partner sleeps just fine, as he enjoys firmer surfaces.  I'm mostly a side-sleeper, and I'm hoping that the bed begins to accommodate my body more over time.  I still find that it's a bit firm for me, and I get uncomfortable about halfway into the night.  We have not put a mattress cover on this mattress because we want the benefits of the Mint, the cooling technology.  We think the mattress cover will defeat the purpose of having purchased this type of mattress/foam.  If you're a back sleeper, this bed is great.  If you're a side-sleeper, you may find it a bit firm (though I hope that changes over time).