I have this as well and agree that it is quite good, but at its price I will not be buying another bottle as there are many others I like more. The relationship to "standard" 12 y.o. Glenlivet is obvious in the flavor; Nadurra is like Glenlivet 12 on steroids, and lots of them. It has the same sweet, honey & nut flavors that dominate the 12, but in the Nadurra they're more of a base, an undercurrent, and not the dominant flavors. The dominant flavors are all fruit (apples, pears) and spice, with a bit of vanilla that pops up once in a while.
If you like Glenlivet 12, you will very likely adore this. If you don't, you won't. If, like me, you're fairly indifferent to Glenlivet 12 (i.e. I will drink it if there's nothing else, but it's far from my dram of choice), you probably won't think it's worth the bucks when you could spend about the same money and get a Macallan CS, A'bunadh, Laphroaig CS, Glenfarclas 105, etc.