I have had my D70 since about March or so. A few "dust bunnies" have shown on images but not persistently. Some appear to have been eliminated by cleaning the lens and not the sensor so maybe spots on the lens were the cause but I am not certain on that. As for cleaning the sensor, I have not done that and haven't needed to. I use a "rocket blower" 2 out of 3 times when changing lenses. When the blow isn't handy, I do the job quickly with camera facing downward when naked. Personally, I would hesitate to do the job myself simply from lack of expertise and would rather have someone else responsible for any damages.