I have been using this wallet for a long time, and I can't say anything bad about it. At the same time, I can't say that it is a good option for storing my cryptocurrencies. It is exactly the same questionable option as any other mobile wallet. As written here before, the best solution is a hardware wallet. Many people are too lazy to buy a hardware wallet and hope nothing bad happens to them and that the wallets they use will never be compromised. If choosing between online wallets, I would choose metamask over trustwallet.