Hi Marcus, If definitely adds weight to the user experience, so the real question is does the application 'require' it. Is it really necessary? It may be, in which case do it, otherwise its too much of a intrusion and can be especially painful if any inconsistencies are found. I've even encountered problems with form submissions failing because of an error with the data service provider. The user did everything right, but the submission fails. Now that's a bad user experience!
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