I think this is definitely worth it. The 24 hour card is 15 euros and the 72 hour option is 20 euros. For this, you get free entry into almost all the main attractions, including the Arena, Casa di Giulietta, the Duomo and most of the other churches. From 2014, it also seems to cover public transport again, which it didn’t in 2013. I worked out that I would have paid at least double without the card for the places I visited. For up to date information see: http://www.turismoverona.eu/nqcontent.cfm?a_id=40040 .