My USAA accounts were transitioned to EWC+ this morning.
The process worked fine - I was prompted to log into USAA through the web interface, then Quicken apparently redownloaded every transaction in every account, That took a few minutes. There were three duplicate transactions shown in the download window in one account, which I easily deleted.
For grins, I initiated a download transactions after the conversion. The process went faster than I expected. Will see how it goes tomorrow.