A little too secure, maybe! It keeps timing out faster than you can think.
App works well, but needs a few feature changes to make it super-usable. As it is designed now, you have to use an out-of-band method to agree to chat in advance -- you cant simply leave the app open waiting for incoming chats. This is the apps HUGE disadvantage. While, yes, it makes it HIGHLY secure, it also makes it difficult to use.
There SERIOUSLY needs to be an option to adjust how long to stay open in the background, including "forever". This would make the communications over the air secure (what most people are really concerned about!) while leaving the phone potentially a target.
I use the app a lot for secure communications when I cant get a VPN to be stable, but a few tweaks would make the app A LOT more usable and it would become my sole XMPP app.
JonRKibler about ChatSecure Messenger