I successfully used Savon to interact with the Bullhorn Staffing SOAP service about six months ago. I had no problems with Savon Jam, all my headaches came from inconsistencies with the service.
My interactions with the service were limited to getting data (simple) and clicking data that could include a resume file (more complex). I did not need to look much further than the Savon document to understand everything that I thought was simple to understand and easily applicable to my specific set of problems.
TL; DR; 1 vote for Savon, despite what you may have heard.
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