3D ultrasound?

So I want a 3D ultrasound but at the same time I don't, for one because I don't want to pay $150 to see her, and I want to be suprised what she looks like when she's comes out. I think she's going to look like her daddy. And I want to see that they day she's here and not in a picture, and she's active so I think maybe it would be hard to get a clear image of her. What are some of your thoughts and experiences with 3D ultrasounds?