xpath and biztalk; really?

stringTmp = "string(/*[local-name()='SXPTaskUpdate' and namespace-uri()='SXPTaskUpdateTN']/*[local-name()='Task']/*[local-name()='Customer']/text())";
stringTmp3 = xpath(Message_1 , stringTmp);

and
stringTmp = "string(/*[local-name()='SXPTaskUpdate' and namespace-uri()='SXPTaskUpdateTN']/*[local-name()='Task']/*[local-name()='Customer'])";
stringTmp3 = xpath(Message_1 , stringTmp);

returns: Customer_0
stringTmp2 = System.Convert.ToString(xpath(Message_1 , "/*[local-name()='SXPTaskUpdate' and namespace-uri()='SXPTaskUpdateTN']/*[local-name()='Task']/*[local-name()='Customer']"));

and

stringTmp2 = System.Convert.ToString(xpath(Message_1 , "/*[local-name()='SXPTaskUpdate' and namespace-uri()='SXPTaskUpdateTN']/*[local-name()='Task']/*[local-name()='Customer']/text()"));

returns: Microsoft.XLANGs.Core.Part+ArrayBasedXmlNodeList

One good source I've found is this:
http://social.technet.microsoft.com/wiki/contents/articles/6944.biztalk-orchestrations-xpath-survival-guide.aspx