FWIW, I haven't found the lack of product info in Paypal to be a problem. I just print an invoice to use as a packing slip in Zen Cart.

OTOH, Paypal's omitting the shipping address and thus deactivating Seller Protection IS a major problem and may drive me to setting up my own CC processor, since a big reason I stuck with Paypal was the ability to print postage labels in PP and have seller protection and shipping insurance included.