I only have experience of Miaomiao 2.
It has been good but ...
- support is not good. If you go ahead with it, I recommend buying from the .eu website rather than the .cool (Chinese-based) website.
- battery life is much shorter with Miaomiao 2 than Miaomiao 1. Even from the start, it didn’t last the life of a single Libre sensor. After a year and of use every day, the Miaomiao 2 battery last 3 days.
In hindsight, I would buy Miaomiao 1.
On the other hand, I eagerly await Libre 2. The Android version of the LibreLink app can be patched so not to need a separate transmitter (Miaomiao or Bubble). This is the reason I have not replaced my Miaomiao 2 as I no longer believe it is worth the investment.