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Robin, yes I have shut off EGR on my 2007 Jeep Cherokee CRD, (which runs a 2.8L VM Motori engine). I did this back in 2009, and it has run perfectly ever since. I want to point out that in my opinion, this significantly prolongs the life of a diesel engine, and you only have to look at the oil to appreciate how clean it keeps the internal surfaces and thus wear reduction caused by combustion product ingestion.
Blanking off the EGR can cause a number of problems, but there are ways to disable EGR operation without a blanking device; software changes are probably the best. Software changes that delete EGR operation are available, and while technically not legal, there are no emission system inspections in Australia, and therefore likely no one will ever know.
The reason I do not recommend simply blanking off EGR ( which is usually done at the exhaust manifold), is that some manufacturer software uses the same pipe pathway to dump turbo over boost into the exhaust manifold (this is a very effective technique to extend the life of variable vane turbos and negates the need for pop off valves in the turbo intake). The software simply opens the EGR in over boost throttle lift off situations and thus diverts over boost into the exhaust system. If you block off EGR then that over boost cannot be dumped and you have a situation where over time the turbo can be damaged, and turbos are expensive to replace.
Finally, shuting off EGR on old diesels is usually a waste of time, money, effort etc, simply because the damage that will have already been done to internal bearings, rings, etc has already been significant.
If the vehicle is fairly young, and you intend keeping it for a long time, then yes there are life span extension benefits. The exception might be for vehicles under going a full rebuild, with replacement of old internals with new parts, sadly most Euro diesel designs cannot be rebuilt anymore (Mercedes are terrible in this regard).
So that is my 2 cents worth.
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