The mattress arrived a day earlier than expected.  We unwrapped the mattress and let it 'breathe' for 2 days before using it.  It expanded to exactly the height we hoped for to fit just under our fixed headboard.  We slept on it for the first time last night and it was extremely comfortable.  What I particularly loved was the fact when my husband turned over in the night the mattress remained stable, that was a big plus for me as our previous bed although comfortable tended to move whenever my husband did.  My only gripe would be it had no handles otherwise I would have given it 5*.