This is an excellent lens from Nikon, and I would highly recommend it. The colours, contrast and sharpness produced by it are simply wonderful. Build quality is semi-professional, but the optics are pro all the way. I'm comparing this to the 24-70 f2.8 which I owned briefly in the past, and frankly I can see only small differences in the results produced by each lens. This 24-120 is also considerably lighter, shorter (when the zoom is retracted) and slightly cheaper. A great choice for advanced amateurs and professional photographers.
As a walkaround, this lens has replaced the 24-85 f2.8/4, 35mm f2, 50mm f1.8, 85mm f1.8 and 70-300mm f4.5/5.6 in my bag, and my photography has improved massively as a result as I am concentrating on the photograph rather than the equipment. I'd made a calculation of the numbers of photographs taken with each lens, and furthermore at what focal lengths, and I found 99% of them were in the 35-180mm DX focal length range which this 24-120 offers a D300 user such as myself. Best of all, is that when I eventually move on to FX Nikon, this lens comes with me.
This is an expensive piece of glass, shown by the gold ring, but worth every penny. I love the results this lens has produced for me so far, and look forward to continuing to use it as my normal 'one-lens' solution. I've found that the only other lens left in my collection, the 50mm f1.4 G AFS is a perfect accompaniment to the 24-120, and finds plenty of use in very poor light and for portraits. If you are considering a walkaround do-it-all type of lens, this is it.