Is there some information about benchmarking about XSL proce

I've found some information about existing XSL processor as follows:

 saxon, koala XSL processor, XSL:P/ ,  xt,, lotusXSL processor, and
Datachannel-MS java Parser( supporting XSL templates)

Is there any Information about benchmarking of XSL processors?
When I try to making new html documents with some sample xml and xsl
documents
There exists some ambiguous points in processing templates.
for examples, <xsl:value-of  /> is well transformed in SAXON  but not in
Koala XSL. In Koala XSL, It transform define xsl:value-of as
xsl:value-of  expr=""

If you have some benckmark or any comparsons about XSL processors, let
me know pleases

thanks in advance

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