I'm reading with astonishment a number of forums where people are complaining about the D7000, in particular the focus system seems to cause a lot of problems. I have just received mine, and must admit that the focus system is quite advanced with a number of settings where you easily can go wrong. I also see that a number of the D7000s are returned to Nikon for fixing the problem and are reported ok when they come back, which tells me that it must have been something wrong. My question is if all these complaints about focus issues are real or if this simply are user errors. And if they are real, how can I test mine to see if I have something to worry about?