Hi, I have had no luck installing this OS: it gave me and the kernel, pani; then when booting safely , it gave me a message saying 'completing installation 10 minutes', then it rebooted and panic again. Have not been able to run it for more than a few seconds. Now I had to revert to Yosemite via my Time Machine after the MBP 13" kept on showing the 'dead circle' icon. Since installation and subsequent restore it takes about 4 or more hours to get it back were it was. This release is to be avoided if you don't want to brick your computer. If USB devices are frozen ,you won't have a chance to recover your system and files from Time Machine.
I had to press 'alt' key during kernel panic to try and get my usb drive backups to boot and it did it only at random and by chance I got it to boot into the USB3 time machine disk.
APPLE, please do not launch Beta OS X like this one : it is the first time I had kernel panics since my first Apple Mac PPC Tiger back in the 90's and I have upgraded OS and hardware without any problems before: the Good Old Times!
I was in utter angst that I had lost my laptop for ever: please Apple don't launch software when it is not even in beta; this one is in alpha in my opinion.
My Apple kit: MacBookPro13" Mid 2012 Fusion Drive No DVD drive 8GB memory