I own this app on my iPod Touch and it has one feature that - for me - sets it above all others: I can listen to Radio New Zealand on it.
No other streaming media app I have seen lets me listen to National Radio in real time.
NatRad is only radio station I listen to. No ads and loads of interesting current affairs and Kiwi content.
WunderRadio is a must-have app on my Android phone. I paid my US$6.99 in seconds.