Hi all. This is my very first post here. Have been Snooping around for a while though.... and may I add what a luverly bunch you all are! I have recently sold my Sigma 500 4.5 as I hardly used it. I am want to get a "replacement" which is more useful and have narrowed it down to The 300VR and 200-400VR but am really confused. I have read hundreds of articles and reviews saying that they are arguably Nikon's finest and very close in IQ. I generally shoot wildlife and aircraft. Almost all articles or posts I have read about the magnificent 200-400 mention it being tripod mounted whereas quite a few of the 300VR posts are handheld. I have not had the privilege of handling either , so all you lucky people who own either or both (Gosh!!!) , please offer me your sincere opinions as I ideally wouldn't like to be tied to a tripod and how much better would the 200-400. be over the 300VR for wildlife and aircraft if at all. Thank you.