Worth it if you'll hit several paid sites fast and ride a lot of transit — it gives free entry to your first one or two sites (skip-the-ticket-line, not skip-the-security-line) plus unlimited buses and metro. If you're mostly seeing free piazzas and churches, you won't break even.
The official 72-hour pass costs €58.50 and includes the first two participating sites plus public transport for the card's validity period. · romapass.it
The 48-hour pass costs €36.50 and includes one participating site; Colosseum and Borghese Gallery visits still require advance reservations and availability checks. · romapass.it