I have a possibly paranoid concern about this type of camera. The image in the viewfinder or on the rear LCD is produced by a secondary sensor located where the pentaprism would normally be, not by the main sensor used to capture the photograph. That's one of the reasons this type of camera needs a mirror. It seems that if there is even the slightest misalignment of the secondary sensor or the mirror, the image in the viewfinder could be in focus while the captured photograph would be slightly out of focus. This is the same thing that can happen in a traditional SLR if the focusing screen or mirror is slightly misaligned. In contrast, most cameras with live view use the same sensor to display the live view and to capture the photograph, so if the live view is in focus the photo will be in focus. I guess in practice the Sony approach probably works fine, but you're counting on them to align everything in the camera perfectly at the factory.