I’m using it continuously since March 2018 on only 1 Samsung S7 phone. The app is very stable now and I’m very happy with the results.
Until now I earned a bit over 1600 ETN, with only a few referrals. Due to this huge crypto winter (bear market) I do not care how much this worth in fiat, because I know with the next bull run I will be happy with the return (was 0 effort).