EXADATA configuration using Vintela for OS authentication

I am interesting in other customers experiences on having EXADATA machines set up with Vintela for OS account authentication. I will like to get information about their experiences with the following:

1-Have you kept the oracle account that owns the cluster configuration, binaries and databases in the EXADATA machine as a local account after Vintela was installed?  or have you removed the oracle local account and use the Vintela configuration for that account.

2-Did you remove any rpm packages from the EXADATA machine during the Vintela configuration (like PAM, SSH, etc) because Vintela was installing its own?

3-Have you had any problems during the deployment of the EXADATA patch bundles due to have Vintela is installed? How maney patch bundles have you installed in your EXADATA configuration where Vintela is installed?