My first experience:
*********** Edit 24.01.2022: ***********
New beta 20220123 available
*********** Edit 25.01.2022: ***********
With FP-OS and all Google services uninstalled, I was extremely happy with the battery performance and my SoT. 5-6 hours SoT.
After installing /e/OS I was brutally disappointed. Battery was soon empty faster than I could look.
Now with iodeOS everything is great again.
I am more than satisfied.
SoT over 6 hours and 38% battery left
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Another positive point: I can now use trebuchet launcher in pure culture again.
No more need for lawnchair or omega.