I use signal as my primary sms app, for both encrypted and regular text convos. My primary gripe is people who use it to occasionally buy cocaine, amusingly obvious because of the notification you'd get (at least in the past) when a contact in your phone created an account, and it's like 3 am on a saturday. (Ironically it's 3am on a Saturday right now for me.) Ive had more than a few missed communications because they were sent over signal to someone who either subsequently deleted the app, or, thinking of it not as an all purpose messenger, infrequently opened the app and did not see my message til weeks later.