Terrific mattress, im 20 yrs old and have had a waterbed for over a decade.   I was very used to the sinking of it and wasnt sure how this mattress would do.   Well this is a great choice for someone who uses their futon everyday.   I went with the queen size and use it for my primary bed and as a occasional couch.  Im about 6ft 4in and close to 195lbs and this thing works great.  So glad i went with a inner spring mattress, cuase  it really is soft and yet firm.  Ive had it for alittle over a month and have slept on it everynight.    never had any problems getting used to it.