There are two reasons I am giving this tour 3 stars,
1. At 25 euros it was quite pricey
2. It was a funny tour rather than a creepy ghost tour
However having said that I LOVED it! It wasn't what I had expected, I had expected a couple of hours of thrills and chills and horrific ghost stories, whereas in reality it was a couple of hours of comedy delivered by very funny actors which is why it gets the three other stars. However, my thirst for scary stories hadn't been quenched at the end of the tour so I went on Hidden Dublin Walks Haunted Tour. I booked online for only 6 euros (for the whole two hours) at http://www.hiddendublinwalks.com and I was really pleased by what I got for my 6 euros. The walk was aimed at being genuinely creepy, there were some great stories there, it was a healthy mixture of history and paranormal on the tour and everything linked quite nicely. The only downside was the walking, but if yo enjoy that you will love this tour.
So for hilarious: go for the ghost bus
For creepy: go for the walking tour (also if you don't want to hurt your wallet as the price difference is huge for something equally enjoyable) read more