iOS 8 has been garbage (Ipad air user). On par with MS Vista launch IMO. Crashes, bugs, slow performance, wifi not working, safari laggy, just bad all around. Reason I bought the ipad air was the smoothness of it all and lack of lag compared to its android tablet counterparts... guess that'll teach me. At least on Android i can flash different roms.

10.10 however runs really well especially on my old 2008 Macbook Pro. Granted it's been upgraded with an SSD and 6gb of RAM but it runs so much better than 10.9 ever did, and that was the beta, havent even tried the final release yet.

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1985 CA 300D Turbo , 213K mi

I upgraded to Yosemite last night and I love it so far on my MBP from 2012. I haven't played too much with all the features though.

I'll wait a couple of weeks.

No issues using iOS 8.x on an iPhone 4S, 5 and 6, iPad 2 and 3. Updated Mavericks to Yosemite overnight and the only software that needs updating is Printopia.