Corporate installed 2016 on one of our test computers to verify our remote location install. The new 'look' will take some getting used to, but I mostly use the S key so I won't be looking at menu bars. I have a feeling my co-workers will have more to say when the rest of our machines are upgraded later this month.
We switched last summer from 2012 to 2015 and some thought it ran slower but that may be an issue with our network switch that is currently being addressed. If you know me, I blame workstation specs for some performance issues, but that's my $0.02.