I would like to see DVDFab be able to coexist with Roxio. I have an HP pc as do many other people here. The HPs that I'm aware of come with some sort of Sonic programs installed that serve as some of the basic burning software. When a new Fab update comes out I download it to Save to CD. That CD Burning Wizard has the Roxio name on it.
Now, while I have not noticed any conflict between Sonic Record Now and DVDFab, I probably wouldn't know one if it came up and bit me.