If you’re a serious Nikon user, especially if you shoot landscapes or portraits, then Nikon Capture NX is worth the price and the time needed to get to know it. However for most people it’s just so much more complicated than it needs to be, and it’s relatively expensive - For anyone new to digital photography the excellent Adobe Photoshop Elements costs half as much, is a proper imaging application and includes Adobe Camera RAW and the best skin tone color adjustment control around, plus you’ll find it far easier to use. For more serious users, Bibble offers a much better interface for a lower price, and performed best with D70 files.
For pro’s, U Point alone is probably worth the money - even if you’re not a Nikon user - it really is that good.
RAW processing results with Nikon D70 NEF files are very good, not the absolute best in terms of sharpness and detail, but very close. Where Capture NX is the best is in the control it gives you over the final image, especially the extra color control offered by U Point, but it’s hard work, and much slower to use than most others, so I’d strongly recommend you download Nikon’s 30 day free trial before you get the credit card out.