Web Service exposing Java Collaborations vs designing with eInsight

Hello
I have relatively little experience in designing and implementing web services. We are now looking at implementing some minor services with JCAPS.
I would like to have some input on above subject. what are the pros and cons using either of the strategies. Today we do not use eInsight.
I have understood that you do not have access to the SOAP message when exposing a java collaboration as a web service. I can also understand some of the drawbacks if you develop a ws consumer and you want to manipulate the SOAP message. But if you develop a server service implementation, when do you need access to the SOAP message?
Other issues that might arise:
Security
Distributed transactions
Any references to best practice resources, biased towards JCAPS would be highly appreciated.
TIA

Hi again
We are also interested in in using attachments in the SOAP message. I have googled a bit and from what I have found it seams that it is "not supported out of the box"
Can anyone enlighten me in this area?
A general comment, I find it very hard to get information from the documentation of JCAPS, maybe I have missed something so please direct me to the right source if you find my ?? to much "newbie like". Things like, specification of packages, classes, methods, parameters with data types, Exceptions etc where can I find it in JCAPS?
As an example, The SAAJ package throws an exception in the log in 5.1.3, so it must be there. Where can I find information about that implementation in JCASP?
TIA and Br,

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