Here's just a simple testimonial to how much an improvement can make out of the box. The first two images are without VSS - first the straight render, and then what I managed to do in Photoshop by blending layers and playing with hues. The third image is a straight unretouched render using the VSS1 prop. As you'll see, basically, VSS has salvaged a pretty bad texture.

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Hardware: AMD Ryzen 9 3900X/MSI MAG570 Tomahawk X570/Zotac Geforce GTX 1650 Super 4GB/32GB OLOy RAM

Software: Windows 10 Professional/Poser Pro 11/Photoshop/Postworkshop 3