Reports in rails app

Hi.

I am looking for some reporting library for rails.

Does anyone have experience with such libraries, until now I have
found
* Ruport (Ruby reports) (http://www.rubyreports.org/)
* reportable (http://github.com/saulabs/reportable)
* ReportBuilder (http://ruby-statsample.rubyforge.org/reportbuilder/README_txt.html)
* dynamic_reports (http://github.com/wayneeseguin/dynamic_reports)

The most recently maintained project seem to be reportable. But ruport
and dynamic_reports also looks like reasonable projects. ruport seems
very featurefull

Please provide some experiences and comments.

Jarl