This lens is much like its smaller cousin, the Nikon 18-200 VR II. So what's different? It has a longer reach, all the way to 300 (of course, with the Nikon crop factor of 1.5x, that's really 450mm) and it's also bigger and heavier. It's still not a pro lens nor is it a fast aperture lens. However, for those who want the ultimate in focal length diversity and can handle a little bit larger lens than its smaller cousin, this lens will keep you very happy.
Please note that this is a DX lens and will work best on DX crop sensors.