Great product! I really think the layout of how to achieve successes in each of these sample situations really gives you an insight as to how to run a skill challenge of your own devising. The artwork is incredible and the layout looks very nice (minor issues for me). The scenarios are really well thought out and reflect the amount of time that probably went into describing these. The skill checks make sense. I also love the terrain descriptions and the addition of the traps at the end.
The question I have would only be how would you decide which PC does which skill check and when? It kind of leaves it out there. I can figure it out, but I think it might be helpful to describe this.
I believe the copy editing may have fallen a bit short as there as numerous grammatical errors, missing punctuation, and bad syntax in sentence structure. These can all be worked around and ignored, maybe even fixed in a future version.
Overall: 4 out of 5. I will be using scenarios like this in the future in my own games. I do recommend!