Just be aware that the libre doesn't work (or stay working) for everyone, so you'll need to do occasional blood tests to ensure it is giving you valid results. (I believe that that will also allow it to calibrate against your body, so should improve the accuracy if you're using miaomiao plus xdrip. But don't quote me on this, as I am an ex-libre user, because my body reacted badly to it after 8 months).
I wonder if dexcom will reduce their prices so as to compete with libre?