Why you may love it - These are some seriously pigmented eyeshadows that apply so nicely with little fallout. There is are some great shades in the palette, such as - Sin ( a lovely highlight shade and so buttery feeling), Sidecar, Buck (great for brows), Smog and Toasted (this may be my favourite UD shade, ever). Quite a lot of the shades are warm toned so if you suit pigmented, rich, warm toned eyeshadows than this is definitely for you. However even though I personally suit cool-toned shades I found I could still enjoy most of the shades... though some of the darker shades are just too rich and pigmented for me. But if you love strong smokey neutral eyes then this palette would be perfect in achieving that. Also the included mini eyeshadow primer potion really does work and comes in very handy with all of the eyeshadows.
I'm going to be rubbish and say I just can't answer that as it all depends on your skin tone and what you want to use it for the most. For example I love that Naked2 is more cool toned on my pale skin but for someone with much darker skin to me the shades would be quite warm toned - if that makes sense! But if you do want a more pigmented more shimmery palette I would go for the original Naked palette.
As for if you need both palettes? Well that is basically like asking someone do they need more than one or two red lipsticks! Some people will say of course they do as there are so many different tones of red and some will say probably not - so it definitely comes down to which camp you are in!
I really hope this has been helpful!
If you have any questions on either of the palettes feel free to ask in the comments below and I will try my best to answer them.