The DLC was fairly good for this game, the highlight definitely being the last one in this pack (Tiny Tina). I'd say get it if you enjoyed the main campaign just for Captain Scarlett and Tiny Tina. The other two... I could take them or leave them.
The good news is that these codes which say they are Mac only are PC compatible as Amazon send you the steam activation key by email. Just plug it into Steam and off you go! Glad I took the risk as Amazon seem to have the best prices currently!