Sneak peak test; does it actually work?

I’ve seen a LOT of people taking the test and getting an accurate result. But with that being said, I’ve also seen a few people who have maybe done the test wrong or have gotten a false diagnosis. I read the reviews on their site and it stated that there’s a money back guarantee if they give you an inaccurate gender reveal but mostly it just seems like something most people do for fun or if they can’t get the early testing done through the hospital.

Has anyone tried it and gotten an accurate response? How accurate is it actually? Is it just mostly for fun? Basically, is it worth doing?