I agree that it does show you the importance of how your strumming (and even picking to a certain degree) affects the notes - especially when you play familar songs, or try your normal picking/warmup excercises.
I can't recall having ever chopped at my guitar, but I'm curious to find out what happens...(expect a post involving broken fingers or guitars... :p)
And I agree with 'strings...uber-cool them double ridges...
Don't worry too much about me, ignore me long enough and I'll go away.