The ad shows a fast simple method of touching up your lawn. That is complete BS. After you buy the product, they tell you to do all the pre-steps that you would normally do using your own grass seed but their video doesn't show you that. You CANNOT do spot seeding.
Once you start the process, it is all or nothing & comes out in a 3 to 4 foot pattern. The grass doesn't grow. When you ask for a refund they make you pay to return the empty seed bag & empty vial + the sprayer. Save your money. $27.90 is a lot to pay for a pound of grass seed + return shipping costs.
Bottom Line: No, I would not recommend this to a friend