How accurate was the panorama test for sex for you?

So I've read the panorama test for sex is >99% accurate, BUT I've read quite a few stories where the panorama said one thing then at the anatomy scan at 20 weeks they said it was different. 
I also read that when it is wrong it's more likely to say Girl then turn out to be a Boy. 
So I'm wondering, how accurate was it for you? 

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