I just downloaded it and I really love it now. My Mac got faster, I loved new design, safari is a lot faster and new UI is perfect, notification center is great. I feel like a got a new Mac! And most unbelievable thing is I couldn't find any bug! I mean every single Apple OS had big bugs in the first version and Yosemite was a big change so honestly I expected tons of bugs but I couldn't find any So how are you feel like Yosemite?