Probably the least discussed subject (but one of my personal favourites)
Who do you bank with?
Big banks or others?
I've only found ANZ, Westpac and BNZ offer fee free everyday accounts with an ATM card
What % Interest do you have on your savings account?
Heartland Bank offers 3% call account and NZCU offer 3% for balances >$20k (2.5% for <$20k)
Term Deposits -I prefer my money liquid, does anyone still use these?
What % do you have a car loan or personal loan?
NZCU say their rates start from 8.9% (AA say from 9.95%) but I've found haggling with one another gets you a good rate than originally offered. ANZ currently have 14.95% unsecured personal loan offer and they will drop it to 13.95% with a bit of haggling.
Home loans - do you shop for variable rate or fixed rate?
Kiwibank seem pretty popular with 5.5% (4.79% fixed for 2 yrs)
Kiwisaver - Who do you use? What fees do they charge? Do you contribute the max 8%? Does your employer offer more than 3%?
Simplify (not for profit organization) that has the lowest fees I could find, but as they are still new, I won't be able to gauge their returns % for a while.
Investments - do you invest in the sharemarket? Property or elsewhere?
I'm on ANZ, used to be with the National bank. Don't have a KiwiSaver, not in debt, can't remember any of the details from way back when I was.