Extensible Stylesheet Language(XSLT) gives you all the traditional benefits of a high-level declarative programming language, specialized to the task of transforming XML documents.
The usual benefit cited for higher-level languages is development productivity. An XSLT application for transforming XML data structures can be made much more resilient to changes in the details of the XML documents than a procedural application coded using the low-level DOM and SAX interfaces. In the database world this feature is known as data independence, and it was the quest for data independence that led to the success of declarative languages like SQL and the demise of the older navigational data access languages. I firmly believe the same will happen in the XML world.
As with all declarative languages, there is a performance penalty. But for the vast majority of applications, the performance of today's XSLT processors is already good enough to meet the application requirements, and it is getting better.
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