[R] Mature SOAP Interface for R

[zubin]

Hello, we are writing rich internet user interfaces and like to call R 
for some of the computational needs on the data, as well as some 
creation of image files.  Our objects communicate via the SOAP 
interface.  We have been researching the various packages to expose R as 
a SOAP service.

No current CRAN SOAP packages however.

Found 3 to date:

RSOAP (http://sourceforge.net/projects/rsoap/)
SSOAP http://www.omegahat.org/SSOAP/

looks like a commercial version?
http://random-technologies-llc.com/products/rsoap

Does anyone have experience with these 3 and can recommend the most 
'mature' R - SOAP interface package?