I am not a whiskey fan, so this post will for sure not be able to provide a relevant opinion on the whiskey itself, but I can let you know what I thought about visiting the Jameson Distillery in Midleton (I've done the one in Dublin as well on a different trip)
I went there by car, but you can reach it by public transport as well. It's a 23 min by train and 36 by bus. You can check more timings under this link.
We booked the Jameson Experience Tour and it was 22 Euro per person. This includes a guided tour, a tasting & at the end a drink of your choice (whiskey neat, whiskey with ice, cocktail - one option, soft drink)
The tour lasts for about 1h. It starts with a video that tells the story of the Jameson whiskey and how and why they moved to Midleton.
And then continues by explaining the process that they are using.
They have a lot of trucks carrying barrels placed for pictures, I found them super cute.
You also get the chance to visit a micro brewery where they make GIN, yeap you heard it right, they are making Gin. Now when checking the website to remember the price of the ticket I saw that they are also making beer, interesting expansion of business.
Right before the end you pass by the "cellar" where they keep the whiskey barrels, the cool thing is that they are allowing picture now.
All this is followed by a tasting. You get the chance to taste the difference between a Scottish, an American (Jack Daniels) and an Irish (Jameson) whiskys.
At the end you can have a drink. As i normally don't drink whiskey, I opted for the cocktail version. They had Ginger Ale & Lemon (with whiskey) cocktail, definitely interesting. I would drink it again.
Dublin vs Midelton
If you have the option to visit both but only have time for one, i would for sure tell you to go for the one in Midleton. Why, easy - at the one in Midleton you can see the workplace, the distillery itself. It actually works during weekdays, while the one in Dublin is more of a museum. Now if you don't have this great option and you'll only be in Dublin, then please do check it out as it's an interesting story to discover plus who knows maybe like me you discover that you actually like whiskey in some form (Note: in Dublin I tried the Whiskey Cranberry Juice cocktail, pretty good as well)