Ordered 01/15, Delivered 01/18 (and well packaged!) so A+ for Wayfair!
Took only a few hours to completely flatten, slight smell but was gone before that night.
This topper is medium/firm yet you still sink in a but as you lay down on it, it's the perfect "squishyness" because it cradles you but it's not too deep that you can't even roll over. Been using for 3 nights now and my husband is a warm sleeper, so far no issues with any extra heat from using this. 
Would definitely recommend!