I wouldn't even think of installing this beta, they don't give me any reason to. Maybe if they would fix the contact syncing with non-Google providers, or something.
I have found serious bugs with syncing contacts to Google's servers. I found that the web version of contacts didn't have a bunch of changes I made to a contact on my phone, so now every time I make changes on my phone I look and rarely are they on the web contacts.
I started a case with Google (I have a 5x, so I'm supported) and go to the point they wanted me to factory reset rather than find the bug. I said no thanks. I even pleaded that that would just mask the bug and didn't they want to find the problem? After all, I was completely stock (I didn't even unlock the bootloader).
That is, I do the update. The phone restarts as part of the update, yada-yada... Ok, I'm officially all done with the update. No more reboots. But this service is eating battery like crazy. Manually power the phone all the way off, once more, and then restart. Finally, battery use goes back to normal, and in Settings this Google service no longer headlines as the primary power consumer.