[davidmanze]

Dave, if the AF is as good as on your 150-600 the new version of 70-200 looks very promising. It costs almost half of what Nikon wants for theirs.

I am not sure what exactly affected the optical industry, but I don't understand the price increments with each iteration of Nikon  products:

70-200 version 1 - $1,600

70-200 version 2 - $2,300

70-300 version 3 - $2.800

 There's no doubt if there are no slip ups this lens is going to be one huge hit for Tamron, the Nikor is just too expensive, while the Tamron is endearingly priced!