Hi,
In the paper http://is.tm.tue.nl/staff/wvdaalst/BPMcenter/reports/2007/BPM-07-12.pdf we report the results of an evaluation of jBPM (OpenWFE, and Enhydra Shark).
The workflow patterns http://www.workflowpatterns.com/ (control-flow, data, and resource perspectives) were used as evaluation framework.
Feedback is welcome.
Best wishes, Petia Wohed