I took my 300D into them a few weeks ago under the 4 year warranty. Explained that the shutter button does not focus the camera on half press. Also that I wanted the viewfinder, focus screen, mirror and sensor cleaned. It was picked up Friday, didn't have time to play with it till yesterday. Same dirty viewfinder, same focus problems. Looked closer at the paper work and all they did was replace the kit lens. These guys are about the most incompetent camera repair men ever. I took it back today and wrote on the repair order myself. "when half press shutter button the camera does not focus. please repair or replace shutter button assembly, Please clean viewfinder and all internals of camera as this was a big selling part of the warranty". I should have it back or replaced by the 25th. I'm hoping for a replacement. I went over to look at the XSI and the sales lady was pushing it hard. I told her all I wanted was my camera fixed or replaced and she said she just gave a XTI to someone as a replacement last week and to bad they didnt wait a week or they would have gotten an XSI. Im keeping my fingers crossed for a new camera. Ill keep you guys informed but I am really hoping for a replacement, to get the shutter button assembly out you need to take everything out of the camera, major chore.