I use this module since 2002, I'm a fan of this module. I use it for making monthly reports for the happy user (so they do not bother me with question on how to import a plain CSV file on Excel/OpenOffice). They get the numbers on a easy to use Excel file, preformatted and colored.
I use this module under Linux (Debian and Suse) and Windows (Active State) without problems, so actually I can run the same reports on different platforms without modification.
Documentation is very good. I wish only more examples.
The interface is easy to learn.
Overall rating is "Very Good".