I didn’t like Volla OS. The launcher I got rid of immediately. I installed my usual raft of things and realized that the battery (new 4700 mah?) didn’t get me through the time my Honor 5c with ‘that’ android got me (about 2 days). A 4 year old phone with a 2700 mah battery outperforms…! I was a bit stunned.
Fairphones AOS ist better (also doesn’t battery drain as badly). Ubuntu Touch I found too ugly to use. I’ll install it on a phone to do some development.
SFOS for all it’s lacking, is just so much nicer. I’m doing development now.