In my opinion, this was an xslt tool for people who are not very technical. Eg, an XSLT tool for people who are more business like, and like fancy GUI's.
If you are an actual coder, it is pretty unnecessary. The XSLT code that it wrote was often bloated, and did not use useful constructs such as <xsl:copy> or <xsl:copy-of>. Creating if or choose statements was very, very painful. Using keys was also hard.
I used it 3-4 years ago, so it may have improved much since then.
It is the most useful when mapping items of different namespaces.
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