Shadows are impressive. I feel like I am rediscovering Second Life. This is even bigger than Windlight. I can not wait until this is supported in the official viewer. I found that I could also increase a setting for SSAO (Screen Space Ambient Occlusion). It adds to the realism of the shadows to be darker in certain areas.
Windlight adds to the realism of specific sceens, but the shadows have been desired long before there was mention of windlight. The shadows are not “perfect”, and SSAO seems to kinda bleed a bit. But it just adds so much to the experience.