One thing to consider is that the Paypal Express option uses the address details stored within the customers Paypal account. If you deliver to this address the transaction is automatically covered against fraud providing you can provide proof of delivery if requested.
As much as the current system works reasonably well it does still lack the seller protection offered by the express payment option. We were duped of $900 recently as address details are not supplied to Paypal.
Here's what's on the Paypal payment confirmation.
You received a payment
of $58.22 AUD from xxxxxx
Seller Protection – Not Eligible
Anyhow, I'm not having a dig as like I say the Paypal option has been very robust. it's just a small downfall of the current method but obviously there are the pros you had mentioned earlier.