As an Android developer, its really exciting to see good examples of the tools in action. The documentation on how to debug problems beyond crashes/ANRs is a bit thin.
That being said, I do have one gripe. There are some chasms between the different tools. It is a bit painful to operate all the different performance tools and deal with switching contexts for the same problem. Systrace -> traceview and back and forth.
Also, it would be nice if traceview had a text based api/interface. I know that the graph visualization must be valuable for something, but I spend the majority of my time looking for particular methods and signs of excessive consumption/trouble. Now that I think of it, this sounds like a fun weekend project :)