So after seven years with the iSeries iSeries Enjoyment, I’m moving and seeking another bed. For once, the Serta was all it was said to be, just as firm today as it was seven years ago. No noticeable breakdown and zero wear on the top fabric. However, I’m older and heavier, and as a side sleeper, I’m moving on from FIRM. I’m not sure what model they replaced it with, but if you like longevity and FIRM, it’s a good bet.