You give some good advice. I read a good test recently on dpreview, for checking focusing. I have checked the focusing carefully and it seems ok so far. The HSM is working well too. I haven't had the chance to get out with it yet but as soon as I can, I will. I live on the Isle of Man in the UK where buying anything locally is a nightmare so I am used to having to put things through their paces as quickly as possible for the sake of a possible return. The more I have read about lenses in reviews and from many people on dpreview, the more it does seem that the user is here for QC. I've ben quite lucky with lenses but many people haven't. It makes you wonder how they leave the factory but I suppose they make thousands of these things so there is always going to be the inlucky few who get a bad one.