I took the plunge also - works fine on the office retina iMac......no issues.
... but is not working on the home 2013 iMac - crashes on start-up (normally takes 3 attempts to load) - crashes when I open a file and I get black palettes if I try to move them , then crashes .. have tried to uninstall and reinstall but to no avail.
Also gives me the 2015 icon for drawing files rather than the new red 2016 one.
Graphics card issue? (older iMac has a NVIDIA GeForce GT 755M 1024 MB)