I'm glad there are people that upgraded with no issues at all, and I'm sorry for those that faced them.
I'll definitely wait for the cPFence update before upgrading to v.12, not to mess anything up.
Either way, I'd wait a couple of days, just to make sure the Enhance team has enough time to support me on time with any potential upgrade issues, considering I am unlucky enough.
The tickets might be piling up by now, so I think it would be beneficial to give them some time to resolve them and catch their breath, maybe even release more fixes based on the first wave, before more of us hop on the upgrade rollercoaster.