I'd be willing to give this film a look-see. Cage definitely has talent--we'll see how he does. I got all leaped up about DeNiro playing Capone in "The Untouchables"--so much so that I saw it the day it opened. His role was little more than cameo, but Connery more than made up for it.
For my money, the all-time best screen Capone was Rod Steiger in "Al Capone." This was no better than a B-movie, and not a very good one at that. But Steiger was brilliant, almost as intense in that role as DeNiro was in "Raging Bull" or Brando in "Streetcar." IMO, it was Steiger's best performance, and he gave many great performances during his long career.