If it serves to shut al-Fayed up and the other conspiracy theorists and means that we see nothing more of the odious Burrell, then yes it probably was money well spent.
A shocking waste of time and money. But if if stops that leech Paul Burrell from cashing in on Diana that would at least be something positive. I dont know how he sleeps at night. Al Fayed is just as bad. I know he has lost his son, but if he had not manipulated both Diana and Dodi and very likely tipped off the press about their relationship and their whereabouts then maybe this tragic accident could have been avoided. He should examine his own conciensce.