In my experience, it has been stable.

It's a stable product, it's been running for months.

There are no problems with stability.

There was an issue with zones rebooting due to a CRS bug (Version 12.1.0.2 at the time) which took Oracle support quite a few weeks to eventually identify.

It's not yet in production,so we're hoping it will be very stable. We have some Oracle Exadata which is very stable, so we're assuming it will be a stable solution.

I have not had any stability issues at all.

After migrating Oracle ERP and database, there was an issue with the printer drivers, and issues running some Arabic reports. After upgrading the firmware version for printers, and adding a workaround to avoid Arabic login and reports, all went smooth.

In terms of stability, the hardware of the solution is stable but on the software level we've had some problems. They deal with any issues very quickly. 

This solution is stable.