Does anyone have any firsthand experiences with the home gender test?

I am 13 weeks pregnant. This is my 3rd baby. I'm far along enough to take the gender predicting tests for at home use. I was wondering if they work and give accurate results. I would have to get the cheapest one the store has. But I don't think it would affect the results. Because only target carries them where I live and they're all name brand. My husband and I really want a boy. And we want to know the gender as soon as possible.