I've the AIB equivalent. You get an email every week with the current offers.
From time to time you get 10 euro back for using your card in a supermarket (super valu in BOI's case), a fiver off fuel at a particular brand. But they don't come around often. Its mainly a per centage back from someone advertising. I did get 15% back once on something I needed to but anyhow.
At the start I used to click through the email, and scroll through the offers, but I look at it less now.