I thought that this is a fine accessory for my Vixia HF200 camcorder - until I accidentally dropped it within a week of receiving it. Both side edges of the plastic foot broke away and the microphone / camera interface no longer worked. Fair enough, I thought, my fault, but Canon will be able to repair it. No such luck! Canon (UK) RCC returned it to me with a note saying "This item is a non serviceable unit and hence will be returned unrepaired." At least they had the decency not to charge me for the return postage, but I think that it is utterly reprehensible that the company can't or won't repair this product, despite it retailing at prices between £142 and £200. Especially as Canon make it as difficult as possible to use (much cheaper) third party accessories with their video cameras. So, be warned, if you do buy one of these microphones, handle it with extreme care.
05/02/2010 After reading the comments in another review of this product, I'd just like to reiterate that I am not blaming Canon for the fact that I broke my microphone by dropping it. As I stated above, that's wholly my fault. What does annoy me intensely though is that Canon cannot be bothered to offer a repair sevice for a rather expensive item that has some very fragile parts.