How accurate is the sneak peek test?

Paige • 👨‍👩‍👧‍👦

I'd love to find out the gender of this baby early, but I want a gurantee! I can't find any doctors offices around my area that offer the harmony test, so I'm considering the sneak peek one. I'm just slightly concerned that it may not be trustable? Has anyone done it and had it be accurate? Inaccurate?