I don't now. I think everyone has a different experience with Yosemite. Mine was bad enough. You see CaptureOne and Yosemite didn't work for me, tethering was a pain.
I'm very happy with The Capitan, very sappy. Still Sony Camera Remote Control not working but CaptureOne does the job.
Wacom people sent me a new driver so I'm up to the task.
It is difficult to make conclusions though.
