First, about the movie- the animation and action was really good. However, I was very concerned about the blatant rejection of young Hiccup by his Viking father. Until now, my 6 year old had no idea that some children are not loved or appreciated by their parents. I believed that was an unnecessary part of the plot and made my little thinker have to process more than a kids' movie should have. Hiccup could have been loved and appreciated, but excluded by the other Vikings, but not by his own father! IMO, this film is not appropriate for children under 5 because of the action, but my 6 year old was not scared by it. About the 3D-- it was cool. I do not however know why it's called Imax. Maybe the 3D is done by Imax? This is NOT an Imax theate with the tall seating and surrounding screen. It was just a regular theater with old seats and a normal screen. I might pick regular 3D, but for $13/ticket it should have been more worth that upgrade in price.