I have BETA 2 installed on a separate partition on a Mid 2013 11" MBA. Everything runs well, but when I have the MBA plugged into an external monitor and using the Apple Wireless KB and Trackpad, the Trackpad is a little flaky. Scrolling is sporadic, and sometimes delayed/non-responsive. Just starting to scroll in Safari it will pop up the right mouse click menu. Overall the other pieces work well, its really just the Trackpad. Not sure if anyone else had this issue, and if you had/have a fix. Thanks!