Gave this 4 stars because it doesn't have the density listed (unless I missed it!).
First, make sure to open the topper up and let it expand (30 minutes minimum at 70 degrees)! Also, memory foam always has an "odor". It's a type of plastic, so of course it will! This topper wasn't too bad though, and I am very sensitive to chemical odors.
I let it air out overnight on my covered deck and brought it in to use the next day.
I probably could have got the 2 inch as I already have a latex topper on my bed... but this is still pretty comfortable for me. I like a soft, sink into it bed as I have a lot of hip pain.
And the thicker the foam, the more it kinda wraps around you... Which can make it more difficult to move.
But, so far, this works for me...