they put a lot of load on the PC to make things "pretty." sure it lets you see further more clearly, but unless you're blind there's no *real* reason to have them all the way up =)
FSAA and FSAF smooth up the lines around everything. the 2x, 4x, 8x, 16x, etc... think of it like a scope on a gun. the greater the "times" the futher you can see.
hope that helps,
blood
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