6'5 back problems 220lb (lots of weight in shoulders) (side sleeper). First of all i got the dawn because i thought i needed it as stiff as possible. There was an issue with it where it sunk in on one side. Helix swapped it out no problem Twilight sleeps me and my gf (5'3 150lb bottom heavy, Stomach sleeper) GREAT and my back has felt the best its been in ages.