X3 - I use ImageSynth to create pretty much all of my tiling Vue materials and it's worth every penny. It's true that it works better with certain materials, but once you get the hang of what it will do and not do, working around those limitations in Photoshop isn't hard. i.e. ImageSynth will get you the tiling edges that are otherwise hard to create, but you can go back in and fix the bulk of the tile to your liking - at least this is what I do on the more complicated textures.