HTOTM: FUSION
Original Post
Better quality/more realistic? I'm not sure. There's probably several threads explaining this. I'll be back with a link if there's a decent source for this, or maybe someone can explain.
Wikipedia:
The result is a richer, more detailed surface representation that more closely resembles the details inherent in the natural world.

So, yeaah.. more realistic. Anyone else wanna add anything? =P
I think it gives it shadow and makes it look 3D. I'm not sure, I'm just some random who decided to try help.