Is the delivery really Instant

YES The delivery is INSTANT.

We have a system that delivers coupons instantly after payment to your email 99% of the time. The delivery depends on paypal to send to us your email address. Normally this is instant but 1% of the time it happened to have a delay. Usually this happens when Paypal is overloaded in long holidays weekends when most of the stores have sales and a lot of people are purchasing online. We have seen delays from 15 minutes to couple hours. In very rare occasions Paypal didnt send the info but this happened   once or twice in few thousands orders.

Also keep in mind that email to get to your email address to your phone or computer depends on your internet speed, phone reception and other factors that are associated with your email provider so it may take a few minutes for the  email to show up.