PayPal Express - downloadable product email

I have a couple of questions regarding v2.0.14.

1.The buyer is not getting the “Access to electronically distributed products is granted” email when buying a digital product with PayPal Express. It does not matter if the status is processed or complete. This email is sent when PayPal Standard is used.

2. What’s the advantage, to the seller, of using PayPal Express vs. Standard; other than saving the customer a couple of clicks? Is it more secure? My old system used IPN and that made the sale pretty much tamper proof.