I installed this first beta encouraged by the feedback about improved battery life and bug fixes, but I'm experiencing the same terrible performance as in version 26.1 regarding modem and Wi-Fi connection reconnections, and the battery life remains just as bad as in 26.1.
It's as if I were still on version 26.1, except for the new clock. If you increase its transparency, it sometimes glitches and the entire lock screen displays a strange blur effect when I'm viewing a notification.