its a long time now that I hadn't login in my Adwords account, as my very first campain was a big fail: I lost a good amount there. Nice to see the new interface now, going to start a new one in few days
I have a number of sub accounts in my client center (MCC) account and I would say the majority have been transitioned over to the new format - which I hate! The invoicing provided in the old model allowed me to clearly tell which campaigns were charged which amount (I use very specific account numbers for billing). In the new model, it only provides a 'simplified' invoice with new campaign differentiation! It is one of the first changes Google has made that I am totally against! They should provide an option of whether or not advertisers want to be included in this 'improved' billing page.