This mattress is amazing.   I love it.  I’ve had it for a while and it feels the same as it did when I first got it.   There are no lumps or indentations.   I have it on an old boxspring in my bed that I’ve had for a long time.   I have a very thin cheap mattress topper on it because I don’t need a thick one with this mattress.  There was no breaking in period either , it was a comfortable from day 1.