I've made the leap! I've hesitated on upgrading my iMac and Macbook to the Yosemite OS for months. There have been some user complaints and that scared me. But combine googling "Yosemite upgrade" and reading about the success many have had, with being too over tired to worry, and it became very easy to hit the upgrade now button.
The upgrade was seamless. I had to reinstall XQuartz and Inkscape, but that no longer sends me into a panic (I need Inkscape) as I've had to do that with every other OS upgrade I've done. All my apps work, many work better. And I love the new look. The icons and graphics are flat which was done to simplify them and hence create a more efficient working OS according to my local Genius. It's easy on the eyes and calming. I love how my desktop photo is blurred at the dock area and the entire desktop is blurred until I log in. It's pretty.
Exploring the new OS has been fun. iCloud is really the biggest change for me and I'll be attending a One to One training session to get all the ins and outs. Sweet.
I know there are many PC users out there who swear by their PC and wouldn't get a Mac for their life. But the days of spending hours - even entire days - fixing a PC problem at my house are gone. I do miss my computer tech guy Ashton, though. He was so interesting and fun to talk to. But expensive. He was worth every penny, but I don't miss the expense. He was the one who encouraged me to make the switch to Mac. Gotta love him for that.