Such a guarantee extension makes sense today. The technology and electronics will be more compact, as can sometimes even damage or premature from arising. If not, of course! But the devices are so designed that they will break down after the warranty has expired, if you're lucky, depending on usage of course, then a unit lasts longer. In order to hedge I find a useful extension. One has also invested a lot of money - at least for me it is a lot of money - and do not want to buy in the bag, so it must establish a warranty extension the cat. Even to soothe the conscience. Ergo Direct all documents delivered promptly from a PDF document and everything is described at some length and understandable words. What else can I say? I think the additional investment was worth it, even if I would not suffer a lack of equipment purchased.