SSO with SAML2.0

Hi,

We are looking for SSO solution with SAML 2.0 and it looks there are several ways available to achieve (http://wiki.scn.sap.com/wiki/display/Security/Single+Sign-On+with+SAML+2.0)

We already have SAP NW IdM 7.2 in place so thinking of making it as our identity provider and found following link as a good point to start with

http://help.sap.com/saphelp_nwidmic_72/helpdata/en/64/38385003ce4f2d88602fbf0de78f2f/frameset.htm

Can anyone please share your experience (Limitation/ practical challenges) that you have faced any ?

or

Is it better to go with SAP NW Single Sign-on ?

Thanks,

Karthik