It is not about what it does but how to use it (read this to understand the difference Driver's Guide vs. Owner's Manual )
Check these comprehensive step-by-step walk through's with pictures:
Want to know how to integrate VSTS into your dev lifecycle? - read this Methodologies
Want to know how to accomplish specific activities like stress test? - read this Techniques
Want to know how to tweak VSTS - read this Visual Studio 2005
And most important - enjoy (guaranteed)!