Nobody is disputing that On1 is a raw editor, but Photoshop can be used as a raw editor too if you open your raw file from Lightroom or ACR as a smart object. And that was my point: it seems to me (from the On1 website, not from own experience) that if I want to replace a sky in On1, the base image would be a raw file, but the sky image would not be a raw file. In Photoshop on the other hand I can use a sky image that is also a 'raw smart object'. The only thing is that I would have to do the sky replacement manually by creating my own masks, because the new 'Sky Replacement' feature in Photoshop does not support 'raw smart objects' as skies. If you are interested, I would be able to suggest a work around which makes even that possible.