WES 7 testing

Recently tested WES 7 (or call WS 2011 in CTP1, CTP2) RC version, if using IBW (image builder wizard), it's easy to build embedded win7 comparing with XPE or WES2009. But if you want to build WES7 automatically by attended XML, you should learn how to use ICE (image configuration editor). It's not easy to learn all parameter setting. I have tried many times but result is fail. The system building fail while do shell -setup parameter setting. I checked all document and asked Microsoft software distributor FAE. They said "problem caused by WES 7 RC". Maybe I should wait final WES 7 to verify the problem which I encountered.