Just came back from a WoF at VTNZ, dropped in and out within 25 mins.
Over the past two years, I have been using VTNZ for WoF, and I have never failed since making the switch. I prefer VTNZ because they have no vested interest in failing your vehicle, as they do not offer repair services.
In the past, I used other garages where the WoF might have been cheaper upfront, but I often ended up spending over $100 on repairs that were not strictly necessary for passing the WoF.
One more thing I like about VTNZ is the detailed report they provide after each inspection. Even if your vehicle passes, they include recommendations in the printout for potential issues that may require attention soon, like rust development or perishing belts.
For full TnC please refer to the website.
*New TnC states the validity of the digital voucher is now 3 years (previously 18 months), so might be a good time to stock up before the price hike again.
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https://www.cheapies.nz/deals/vtnz.co.nz