The Beautyrest Silver BRS900 Medium Firm mattress is just the right fit!  We switched from a firm mattress, so were concerned that this would not be firm enough, but the pocketed coils allow for individual support just where it's needed.  The top layers (plush comfort foam and AirCool foam) add a bit of softness, but not enough to be too soft or take away from the firm level that we were seeking.  As with any new mattress, there was a short adjustment period.  I'm a side/stomach sleeper, spouse is a  back sleeper, and we're both sleeping very comfortably!