This tour was ok. The tour guide was knowledgeable about the history surrounding the church and the city generally. You learn about most of this whole standing in the graveyard of the church. Other than the tombstones, there is not much to see.
The real reason I booked this tour was to see old, spooky looking catacombs. You did see them but they were not that large and looked mostly like new construction. The photo on the ad of this tour has this torch lit, dungeon type place. This tour is not that. I didn't even take any photos.
If you are Catholic or Irish, you might be more interested in the history than I was.