Anyone ever used the gendermaker?

Summer • Tue, Jul 12 • Married. 1 boy 3 girls and a surprise on the way.

I just found out about this yesterday when I was searching for gender predictions. I'm 11 weeks and 2 days and according to this you can use it as early as 6 weeks. I have 1 boy and 3 girls I used the inteligender with my 3rd pregnancy and it was right. Was thinking about ordering the gendermaker cuz I'm dying to know! Anyone else use it? Was it right?