Just be careful because Hammer is not compatible with all the shapes you can make in SketchUp. (Also if you think you can just convert someone else model into hammer, think aging because almost all of it will be invalid geometry.)
Pros: Very clear tutorial. This tutorial brought a new tool to my awareness, and an awesome tool at that. You are very clear in your descriptions of the different tools and you give a fairly decent run-through of the basics.
Cons: As much as I hate to say it, this tutorial is way too short.
Improvements: Show us some more stuff about this tool. Its a great tool and I'm sure you can think of more stuff to add.
Overall: A great tutorial, but it leaves the reader wanting more as it is a bit too short.