This wallet since its launch had problems with synchronization, deposits and withdrawals. Most of the comments from about three years ago are negative. Problems with private keys, loss of funds, unstable network among many negative characteristics.
Stabilletera sought to offer an easy way to store Steem on android and iOS devices but they resulted in more problems than positive aspects, problems with security, development. And worst of all, Feewallet got a lot of negative reviews when the real reason for the whole problem was the entire Steem network was more time spent on maintenance and users simply complained about poor service. In the end this project was removed from all of their wallets and services.