I work for a medium size financial company with a bias against open source. The attraction for my company of proprietary solutions is that generally the proprietor can be held to account and support arrangements are a little easier to sell to the accountants. Open source has all kinds of cost advantages for things like licensing software and so on. But what do everyone see as the killer argument for going open source especially in the SOA space?
My experience (similar situation as yours) - We tried Oracle for SOA . Bought their SOA Suite - BPEL et al, Oracle application server etc for big $$. But time and again our experience with Oracle was that they keep changing their stack. eg. Now there is no more Oracle app server we have to buy Web logic app server if we want to go ahead. Another major project failed to start - again not our fault. We just did not get the level of support from Oracle that we expected. Now we have completely abandoned this idea and are looking at options.
I am really interested in knowing any open source solutions for SOA