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It's a scam.
When I was pregnant with Saber, I did some research, and there was a company called "Gender Mentor" which had very similar claims...there ended up being TONS of lawsuits with the company, for being a false scam.
This is a very, very similar thing...I wouldn't waste my money.
From the research that I did on the Gender Mentor (which was the company doing it when I was pregnant with #3 in 2006) they were right HALF of the time, which is par for the course, because you have a 50/50 chance of having whatever gender they tell you to, anyway.
I did some research on this new brand, and the stats are just about the same...about 50% correct. I could "guess" what every pregnant woman I know was going to have, and have about the same rate of correctness.
At this point, the only way you are going to know the gender is to have an amnio test, which is only advised in situations where it is medically necessary, or to have them look when you have an ultrasound. You should have a standard ultrasound at around the 20 week mark of your pregnancy...and this is the point where most parents to be find out what their baby is, if they want to know.
In the early weeks of pregnancy, the infant's sexual organs are not apparant enough to be able to tell just by looking...which is why you have to be around the 20 week point or further along for them to tell you during your ultrasound. This is why if you have an ultrasound at say, 8 weeks, they don't even ask you if you want to know the gender...because THEY can't see it well enough yet.
I know it seems like FOREVER waiting to find out, but really it isn't.

Just bide your time by buying the "neutral" things for the nursery for now...such as the crib mattress, lotions, etc. if you feel the urge to go shopping.
You will know soon enough!!!