Yes I fully understand it is a beta. But it is a public beta that puts Apple's reputation at risk if it is crap. I am concerned the build quality is not there compared to Mavericks 6-8 weeks before launch. I have lost count on how many problems I sent it. The last was that Lightroom's plugins could neither be correctly installed nor invoked on top of the beta. For me that was a deal breaker. So I restored to Mavericks and LR and the plugins are back to normal. I wish the best to all of you who hang in there on the beta. For me, there was not nearly enough bang for the buck.