At NZ$400 the Surface 2 is good value. Whether you should buy one depends on what you want. Surface 2 not for everyone. If your life revolves around Microsoft Office and you mainly use a desktop, the Surface 2 is a great way to add mobility.
Although they share a name, Microsoft has two distinct product lines. Surface Pro 3 is closer to a laptop than a tablet. Microsoft’s marketing directly compares it with Apple’s MacBook Air. Surface Pro 3 runs Windows, it will handle all your Windows software.
Surface 2 is a more traditional tablet. It’s smaller and runs Windows RT.
RT looks like standard Windows, but only runs specially written software. It won’t run all your existing Windows apps.
However Surface 2 comes with its own apps including an edition of Microsoft Office at no extra charge.
You have to buy a licence to run Office on a Surface Pro 3. Office 365 prices start at NZ$119 for a Personal licence covering a single device. I recommend paying NZ$165 for Office 365 Home which covers five computers and five mobile devices.
If you get more than three years use out of a Surface 2, you effectively had the hardware for free.