It is in generaly a great messaging app, there is nothing WhatsApp does better in my opinion, except for 2 things. No.1 Unfortunately some of my friends and even I sometimes experience that messages are shown late. Usually minutes but sometimes even hours. (I use the app daily.) Without this I could have convinced 20+ People to switch to Signal. (-3 Stars for unrelyability (it could be so great) ) No.2 There is no "instant" choice for the app lock.