I have a late 2012 Mac Mini, still running 10.10 no problems, only thing is I can't view live photos as it needs 10.11. I wonder if I upgrade would I experience slower performance? As we know Apple likes to do this to make us buy newer Macs.
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Is 10.11 worth the upgrade?
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@MacOSXuser I'm surprised you've waited almost a year (and now they're beta testing the next release of the OS - now MacOS) 
I too have a 2012 mini, which I'll also be upgrading to Sierra (and installing an 802.11AC usb wifi adapter so I get the unlocking via my
Watch.)
I did however upgrade my ram a few years ago to 16GB (so I know it'll be fine). If you're running with less than 8GB, you might want to consider a memory bump - we'll see if Sierra requires more or not.
I too have a 2012 mini, which I'll also be upgrading to Sierra (and installing an 802.11AC usb wifi adapter so I get the unlocking via my
Watch.) I did however upgrade my ram a few years ago to 16GB (so I know it'll be fine). If you're running with less than 8GB, you might want to consider a memory bump - we'll see if Sierra requires more or not.
You are doing far better than I had. When I tried to upgrade my 2012 mini to 10.10 it just didn't like it one bit. Was very slow and beach balled on just about everything. Even after I tried to bump the memory from the 4 it had, to 8. It wasn't until I threw reason to the wind and upgraded the unit with an SSD and put in 16gb but by that time they had moved to 10.11. It works fantastic. breathed in a whole new life into the little unit.