Visual Studio Load Test Support for (.Net, C#, WPF , WCF, Silverlight)

Visual Studio Load Test Support for (.Net, C#, WPF , WCF, Silverlight)

I need your help to find out Visual Studio Credibility, pros and cons. Can
you please answer me following question with reference links: 1.
Reputation of tool and its results in market? 2. Which companies are
currently using Visual Studio 2010 load testing tool? 3. Reputation w.r.t
the technologies (.Net, C#, WPF , WCF, Silverlight)? 4. What is the market
share of Visual studio 2010 load testing tool?
Thank you in advance.
Regards, Atif Abbas