Hi, Mark.  I used to utilize Substance Painter, Ddo, Bitmap2Material, and some other packages in my texturing workflow, but rarely use them now that 3D Coat supports PBR materials in it's latest release.  3D Coat can do nearly everything available in those specilized packages, but can also work either in tandem with, or completely independently, of Photoshop.  It supports painting PBR materials in Photoshop-like layers directly on your models, with about as many layer blending, brush choices, and masking options as Photoshop; directly in it's own environment pipeline.  It also supports real-time physical based rendering, which I found very useful for quick animation or render previews of the maps.

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