Same, I run 10.9.3 on five machines - 6 year old Mac Pro, a 2 year old 13" MacBook Pro, a 2 year old retina MacBook Pro and a 6 month old MacBook Air. I use Ai

Same, I run 10.9.3 on five machines - 6 year old Mac Pro, a 2 year old 13" MacBook Pro, a 2 year old retina MacBook Pro and a 6 month old MacBook Air. I use AirPlay, external monitors and projectors all the time. No problems here. As we have to remind ourselves at work, hundreds of thousands of happy customers don't complain, but the hundred who do (quite rightly) are very loud.