Effect of Rodinal dilutions?

I am re-asking this one as it gets mentioned often and few do searches to find the answers. What is the difference one will see with various films when using Rodinal at 1:25, 1:50 and 1:100 dilutions? For those who have used it at 1:150 or 1:200 or greater, if you want to chime in it would be appreciated. Are the differences in dilutions the apparent graininess of the film, the mid tones effected, the apparent film speed or some other effect that those who use the developer can use for more creative control in the final images?

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