Inter-AS Option AB

Have any of you tested out Inter-AS Option AB? Its a hybrid between option A and option B. I have been reading about it and implemented it for the first time in the lab for testing purposes. I must say that I really like this option...it brings the best of both worlds between A and B. 

For those of you that have not heard about it, here is the doc:

http://www.cisco.com/en/US/partner/docs/ios-xml/ios/mp_ias_and_csc/configuration/12-2sr/mp-vpn-ias-optab.html

I also like that it can easily be extended to support CSC. Worth taking a look at!

Pablo