The more forums I go into the more bad things I hear about Sigma lenses. Most comments are good but there also seems to be a higher proportion of bad than other manufacturers. A ten year warranty on anything is worth nothing to me if I don't have the full use of it during those ten years. I would by far rather have a product I could unconditionally trust for five years rather than have something that is either broken half of the time or that you had that nagging concern in the back of your head every time you used it? Advertising for Sigma seems to push idea that their quality is as good as others but in practice that doesn't appear to be the case. I'd rather pay the extra 10 - 20% and have the assurances that when I use a product whether it be a lens, a car, a fridge, whatever, that it is going to reliably do what I laid down my hard earned cash for. Yes we have been hearing more horror stories about the Nikon Service Center but those concerns I have seen are more related to the quality of the staff labour. Again, lots of good experiences but far too many bad for a company of that stature.