I'm not going to keep going, you get the idea. From 0 to 25 I increased the render time by more than 3 times. Yes, there is a difference in shadow quality, check out the images and compare. Again, I suggest experimenting with your own scenes and make sure what quality value you need before you dive into a very long render.

But, I will say there is little shadow difference in 25 vs. 50, 75 or 100. But, boy can the render times go up!

And, I will also say that once I put a texture on the ground plane (bricks, stone, rough dirt), it was very difficult to see a difference at all in the shadows with 0 vs. 25

Thanks.

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