Just received this topper about 3 days ago so I haven’t had enough time to judge a long-term use.  Right now it feels great.  Had to replace a plain foam topper that was encased in a plush top cover.  I washed the cover and encased it on my new topper and I can really feel the difference along with replacing my Casper pillow with the Z Shoulder Zone Memory pillow (for side sleepers) and NOW I don’t feel like an elephant is sitting on my left shoulder.