It's not exactly what I expected!
First about the smell: When it first arrived I opened it immediately and it smelled so bad and it took me 2 week to spread the smell .Although the smell is still there.
Second about the firm: What I bought is the upgraded firm feel(Dawn Luxe) ,but it just so soft like you are sleeping in the cloud! The firmness is 8-9 and upgraded? Unbelievable!
Woke up at the first day with sleep with it my whole body hurts I want to return it immediately but but husband said we might need time to get used to it.But what is for fun is three days after his body hurts too! 
All in all this price we can get something better but just not Helix.
I knew Helix through some websites and now I doubt the true, I think I need to let other people know, and the smell also needs to be tested for formaldehyde I guess.