I've had a couple of 70-300 ED's over the years. Not that bad but not deserving of the price tag, nor the ED tag. I found it sharp enough if you stopped down to f8+ at 300mm but not a pretty site at 70mm @f5.6 I didn't find colour fringing a serious problem until it went in front of a D2x. As Stephen says, AF is slooow.
The 300 f4 prime would be great for the birds, even get a teleconverter on and still get AF but I think you'd want the flexibility of a zoom for aviation though. The Sigma 130-400mm maybe interesting, i think fellow WPF member Greypoint uses one, or has done.
cheers,
Andy
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