All the materials that you can directly download from Substance Source do have major issues.
The mandatory nodes are not built - therefor the Material does not look like in the preview.
Example Material: Inclined Lumber Tiles
When you download that material, you can clearly see that the Displacement is missing.
If I have to rebuild every material again, or if I have to add Displacement and tiling nodes then I don't need Substance.
The whole idea is to be able to download Materials, and they should work.
I have no time to mess around with Materials.
If I would, I wouldn't need Substance Source.
So please fix all the materials.. that's pretty hard core to see as a paying customer!