This T-Rex was a great hit with my little one. Upon opening the box, you do have to attach the tail, but aside from that, no additional assembly. The included headgear is pretty simple to attach as well. This guy has a good variety of sounds and the head turns as the mouth opens when the button on the back is depressed. I'm torn whether I like the head turn or prefer the standard fixed neck with just the mouth opening. Only real downside I'd say is the legs move in tandem instead of individually, limiting it's positioning. Coloring is very vivid and has a great pattern. A great addition to any dino collection.