Digital Cameras

Is the Nikkor 70-300mm a good lens?
I have a Nikon D70 and looking for a good lens. I currently use Tamron AF 75-300mm 1:4-5.6 LD Tele-Macro (1:3.9) and then most of the kit lens. I just wonder if it would be better than my Tamron. The prices seem too good, so I wonder if [...]