Has anyone went to an early gender ultrasound? Is it worth it?

I am from Wisconsin and there is a place that offers a regular ultrasound or a 3D ultrasound at 16 weeks to find out the gender of your baby. Everybody I know who has had a baby has done it and it's accurate. I'm just wondering if it is worth it? Or should I wait until I'm 20 weeks at the doctors? I'm so impatient. Opinions please.

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