WIndchill 9.1 M060 to M070 and Creo Parametric 2

We are hoping to upgrade to Creo Parametric 2 soon.

We are currently using Creo Element Pro 5 M150 with Windchill Intralink 9.1 M060, with 2 replica sites.

(Using Oracle 11g R1 11.1.0.6.0 which was supplied by PTC with Intralink)

I would like to keep the Windchill upgrade simple.

Apparenlty, I only need to upgrade to 9.1 M070, and the Oracle gets upgraded to R2 11.2.0.3.0.

(Not interested in Windchill 10.x at this time, which requires a migration)

I tested a dummy upgrade in a test environment, by simply instaliing M06 followed by M070, which worked fine.
But I have not tried to clone my production server(s) and upgrade the clone.
So, I do not know how much the database contents will get updated in the process.

Has anyone gone through a similar upgrade and had any problems/concerns that they can shared?

Gerry Champoux
Williams International
Walled Lake, MI