I got one in a D90 kit, but I never used it, but I can't comment optically.
There are quite a few on Ebay, a lot of people seem to buy D90's with them, and quickly sell the lens. Not sure if this is a comment on its optical abilities or not!
Firstly, why would you like to buy it - what will it do that your current lens won't. Have you considered the 18-70 DX which is considered to be Nikon bests kit lens?