Overall a very good trip, well run and planned. Trains and buses ran on time and the guides Bob and Michael were absolutely great. For me, the first day was not as good - there was a lot of traveling and the sites on the itenerary weren't in my top 10 (of course it was raining and this may have something to do with it). Another small issue was that the bed and breakfast in Killarney was a 15 minute walk from town. If I had it to do over, I would have taken the train from Dublin to Killarney myself, stayed in a place of my own choosing, and booked the tours from there.
Newgrange site and visitor center is great. However, be warned that the food there is expensive and that the line was very long. It's hard to just get a little bite of food. Guide was good but talked a lot