Or iPadOS as they’re now calling it.
It’s been out for a while so I thought it was safe to upgrade on my iPad Pro 10.5. Bad mistake. I lost all my contacts and they were not to be seen on my iCloud backup. Luckily they were backed up on a flash drive. I restored my contacts and they have now appeared on iCloud as well but my iPad won’t backup anything else. Safari is also very flaky in operation. Several restarts haven’t improved things. Another update appeared so I’ve installed that but things aren’t any better. My advice, stay on IOS 12 for the time being.