XPS PRinting and Commenting Similar to PDF Abilities

Have just read an article PC World that discusses XPS capabilities. Of
interesting the abilities to add comments to a documents. I have Acrobat Pro
v8 and mainly use it for report generation, combining 'print copies' from
various sources into one complete document (i.e. photo pages with comments
(Photoshop Elements v5), report body (Word 2007), financial analysis and
charts (Excel 2007), architectural drawings (ACAD LT2007), etc). If I can
combine docs from various sources into one report and be able to comment,
stamp, insert signatures, etc, I am happy to look at XPS.

Any thoughts, experiences, hints, warnings?