No, it's ok Roy, neither did I mean that totally, just that it might help with it being a 'faster' AF. However, with my 300 having had the IS I was very concerned about going backwards and not having it, especially with a heavier lens. Having read Christine's post it looks as though the AF at least compensates a bit for it though, which means SO much to me - though a 400 with IS would be wonderful - but astronomical.
The main thing I was so very pleased about with what you said yesterday though was the flying shots as I find them such a challenge and would hate to have real problems.
I know it's a case of wait and see as what works for one doesn't always do so for another, but... If I do get it though Roy and it really doesn't work out for me then I could always switch further down the line, best way to view it to my mind! Very many thanks for getting back again and for all your help Roy, much appreciated.
Sue