If you're not currently residing in Ireland please use a salary tax calculator to check how much of that you'd be left with.

Many SREs that start at the DUB eventually end-up in other/bigger eng offices such as Zürich, Mountain View or New York. The Dublin office is their largest in EMEA but the vast majority of employees there are working in sales, support or other operational services and due to the nature of those roles the morale is low(er) and the churn high(er) than in other predominantly eng hubs like ZRH.

Disclaimer: I worked in one of those operational roles at Google's DUB office for just over a year after moving on...

Is it relatively easier to move internally from Dublin to other locations?
Savings wise I wouldn't be saving much more than my current job but I am thinking this to be an opportunity to travel and experience things.