Why I dont recommend Signal to my friends
I have two main gripes with Signal:
First, its only on mobile. I want something on desktop too, because I dont see a reason to awkwardly type on a smartphone if Im in front of a PC anyway (which I am most of the time). They do have a kind of desktop client theyre working on, but its a Chrome app and connects with your Android phone. I want something I can use to communicate even without my phone, not to mention a solution which doesnt lock me into a specific browser. Update 2017-04-26: You dont need Chrome running in order to use it. Still, Id still like not to be forced to install software Im not using.
Second, Signals SMS/web identity crisis is not particularly user friendly. Hey, why isnt my secure SMS delivered, I hear the potential users yelling before heading back to the warm embrace of Facebook Messenger. The question of an SMS fallback has been discussed several times on the Signal issue tracker; see #3220 and referenced issues for more information on why we wont see it.