If you've got an older example of a current model then you should be able to get it re-chipped without too much hassle.
Once the lens is discontinued then you only have as long as it takes for Sigma to run out of stock of chips before it becomes redundant. Unfortunately the 400mm lens has reached this stage some time ago. I believe it's possible to use one at full aperture but as soon as you try to stop down you get the dreaded Error 99.
Anyone selling one of these secondhand will know whether it's been re-chipped and will surely emphasise this point as it means a higher price can be asked
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