I cannot recomend it at all to anyone, sorry.
Tour guide was nice but not very talkative or very knowledgeble since in the driving hours he used celtic and irish music to entertain us. Moreover visiting Trims Castle, Hills or Slane, and Monasterboice's he told us to read the panel informations if we wanted to know about their histories.
So, expect to spend a lot of time in the van traveling, and take into account that the Trims castle tour is misleading as you're limited on time 30stop, and the ticket does NOT include access to the inside of the castle, you're limited to walking the exterior grounds.
Apart from that we didn't visit Slane's Castle because in words of the driver: he don't know why it's offered in the first place if there is no time to visit it. That was also an unfortunate response to it.
Finally, the last stop was the largest site, however, we could only park on the side of the road and see the attraction from the hedge of the street. I mean, I knew we would not be able to enter the tomb, but we never thought of seeing it from so far away. We thought that, at least we would be able to experience it from the outer gardents that surrounds it, not simply from a mound in the same street.
Overall was very unfortunate.
I'll give this tour just one start becase the guide was a nice person and we passed by the Bendictive Monastery where I was allowed to get off the bus to take a picture for a sec.