Great company with the best option to replace our 5th wheel king (we're full-timers). We were hoping the increase in number of springs would provide more stable support as we upgraded from the hybrid medium-firmness (after a month of falling into a hole to cuddle with my groom of 40+ years - not just the surface foam either), didn't happen and sore backs each morning still at 4 weeks on the Plank Luxe Firm side... gonna flip it to the Firmest side  and hoping for the fantastic results from so many other reviews... it's a bit confusing at the moment. Maybe, make sure you have a long, heartfelt "conversation" with a sleep specialist, we wish we had done that!