The whole point to have users from the sources on master is to help us to find issues we might missed during the development (because it's a branch that's made to run, we only merge into it when we are OK with the new code to add after multiple code review).
That's a kind of a moral contract if you are using it from the sources: you don't pay for anything despite having all XO features for free. In exchange, you can report issue or ask for new features while being able to see a fix fast because immediately after a fix is merged, it's available on master.
If you want stability and no surprises at all (let's say to run XO in… production 😄 ) then XOA is the way to go 🙂