I've never had the original, so I can confidently say this is "Better than Bailey's Irish Cream".
Put everything in a glass bowl, and whisk it all up smooth. Ideally, this calls for Irish whisky. I only had Ballentine's Scotch, and I don't really know the difference. Store in the fridge, and mix well before use.
It tastes great! Here's a tasty shot to make with it.
Add to shot glass in the above order. Pour each ingredient over the back of a
spoon to achieve a layered effect.