you get all the goodys from the digital deluxe+ 30 days gold member
you may only use one gold member key per account.
however, you can buy a silver edition on amazone (or anywhere else) and add that one for an additional 30 days. atleast that worked for me before f2p.
But i think the keys are still valid for the 30 days included in each edition. Even old gametimecards should work still.