I have been using it since last few years, it's working fine, claimed several airdrops, was fast & smooth. So far it's been ok. It's closed source tho and some have lost their funds. So exercise caution, for security nothing is secure as hardware wallets.
Hi Libert19, The only reason any user has ever 'lost' funds is because they failed to correctly backup their wallets or shared phrases with a scammer. As long as you backup correctly and never share your phrase with anyone then you have nothing to worry about. You can read about Coinomi's security features here:
https://coinomi.freshdesk.com/support/solutions/articles/29000016248