I don't know what the cost is, because logging in to view the prices requires me to give over all of my personal details including date of birth, weight, address, ethnicity, and medical background
But I can tell you that a diet based on supposed DNA results is not something we recommend. No matter what they send you, you'll lose weight because you will be sent a basic low calorie prepackaged food plan. If you stick with it, you'll lose weight. If you stick with just about any diet plan you will lose weight. The trick is finding a diet plan that you enjoy because that's the diet you'll stick with.
If you have viewed their menu and tried their foods and think you can stick with it and want to pay whatever they are charging, then you'll be fine.
They'll use your height, weight, gender, and the medical background (food allergies or diabetes etc) that you provide during registration to determine the best calorie range for you.
If you are interested in prepackaged food plans, my advice is to check out all of the food delivery services and see which sounds the tastiest plan that fits best in your budget.