Pros and Cons of grinding/polishing combustion chambers smooth?

I like to read Chad's post over on Speedtalk.com . I sure have learned a lot of the professionals that post there. Some VERY heavy theory too.
Chad's a good guy to talk with... I think I will have him try to see what he can do with a set of Gen 3 heads when I'm ready.

Talk about 'theory'... I get lost pretty often over there. I guess those three years in 3rd grade didn't do much...