I just have to say that Leica customer service is beyond reproach. I screwed my M9 sensor on a trip to NYC on a train by holding the camera up to the train windows. The train vibrations shook loose all kinds of crap onto my sensor (I was using long exposures for creative effect). I sent my M9 and 35mm f/2 lens to Leica hoping to get my sensor cleaned. They cleaned my sensor, calibrated the lens to my body (turned out the focus was off at infinity), and did some other little housekeeping things (like replacing a portion of the back that was peeling off). All for FREE. Yes, free. I told them how the sensor got screwed through my own stupidity. No hassle. Emailed Leica from the site, got the address to send my camera and lens to, shipped it, got both back within 3 weeks. Calibrated and pristine. All free without hassle.