Dieselly,
I don't think a lot of people on here are using performance chips, hence the low response rate.
I don't use one, but my understanding is that Turbo Diesels will respond better to being chipped as they can change the boost pressure etc. Some petrol cars can't be chipped (Lexus IS 200 for example).
And finally, Wheeler Dealers would always take them to get the chip fitted and the maps updated by hand, this normally takes an hour or so, but I believe that you will get much better results over just buying a chip of the shelf and fitting it yourself.
I would also do some more research on other sites, just in case i'm wrong (it happens, too many times!)
Oliver.
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