I have three Macs, one from 2010, another from 2013 and the last one is from this year 2017. They are all running High Sierra without any noteworthy issues.
They are all being used for relatively mundane tasks, stuff that any typical consumer would use them for.
I do run a VirtualBox virtual machine (running Windows 10) on the latter two so I can run one Window program. That also works fine. I've tried running VirtualBox on the 2010 system but it's really slow; it appears VirtualBox is not optimized for that old CPU. Pity, but that's not a problem with High Sierra, that's on VirtualBox (Oracle).
If you are skeptical about High Sierra's current QA, you are free to install it on an auxiliary drive and try it out yourself. if you don't like it, just boot from whatever system you currently have installed.