no focuse hunting,
with TC - you get 600mm with good aparture.
Cons:A bit heavey - need a strong back and a good backpack
,expensive - oouuch...
This superb lens gives the ability to take daylight pictures from long distances even with poor light. the VR mechanism cancel the hand shake like magic.
with crop factor you'll get a 300mm lens taking picture at dusk with no flash and no tripod.
adding to this a kanko or Nikon converter (I have the TC20II)
gives you 600mm all the way with only 2 f-stops lose.
when it comes to portraits this lens is excellent as well.
although a bit heavy until optic technology will get lighter (somewhere around the year 2400...)this lens will stay in my backpack as a prime lens.