I set up a transaction and savings accounts with ING some years ago, reimbursing atm and foreign exchange fees was a good draw and it became easy enough to hit the requirements for the bonus rate.
I've since got a home loan and offset account but still keep the ING savings as a holiday fund account and i now have my personal savings (separate from my and my partners joint savings) in a Citi bank account for the introductory rate as you can only have one bonus rate saving account with ING.
Yeah it's like 5 a month or something. I haven't hit the limit yet.