Yes, I found it interesting, but I'm confused over a number of little points.
a) I dont use the S/H tool, but if my eyes do not decieve me, it makes halos all over the place - is this correct?
b) In example 2, when he starts using the BlendIF sliders to limit the change to just the sky, he changes both the underlying layer as well as the top one. As far as I can see, it just needs the Yellow lowering to around 116. What am I missing?
Of course we are lucky using CM in that we can pin a sky to get realistic results!
Bearing the above in mind, the attached photo has an almost exact Brodie sky match in the top left and a very noticeable decrease in saturation towards the horizon (as pointed out my Mike).
So would you like to have a bash at improving this image? (I had thought of posting it as an example for the current course, because we play with 'bad' images, but not often with moderately normal ones).