Likewise we upgraded about 3 months ago and everything is green The interface change takes a little to get used to but you soon find your way around.
I stay up to date most of the time, so I did upgrade to 12 when it first came out and then 12.0.1 when it dropped. I've had very little problems with Solarwinds over the years and find that most issues can be resolved by running the configuration wizard again, it does a very good job of bringing things back to proper functioning. I've only had to make a couple of tickets and they are generally very quick to respond and work with me to resolve any problems. The one big key (but then you probably already know this) is to do a database backup prior to the upgrade. I've never had to restore from one of the backups, but if you did get to that point and didn't have the backup it could mean a whole lot of work.
I'd feel comfortable saying 12.0.1 is very stable. We have several components but NCM isn't one of them so I can't speak to that portion.
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