Jaffa: I have both too, I work for telecom wife works for vodafone and her brother works for woosh so lots of freebies and cool up and comming info always left around the house. We get the best of both mobile worlds for free :)
We are a Telecom camp at home, missus works for TNZ, and I have done 2 tours as Corporate Account Manager & Business Account Manager for dealers, and just been offered a 3rd (which I have turned down).
I took an LGNX225 home a few weeks ago, and missus thought it was a Vodafone! I think I was about to get grilled... I would dearly love a Voda 3G handset, but I need/want/use $10 text, and most people I communicate with over mobile use TNZ and would incur cost to contact me if I changed...
Lets see what happens when number portability blurs the lines eh?