My only problem with signal is they way it announces when a contact gets it. It should be opt in. Many people might not want every contact they've put into their phone over the last decade to know that they got or have signal. It's a nice idea to think that everyone has only contacts they would want to share signal with bit that's not the reality on the ground.

Aside from that, it's really gotten pretty good. I've been running it since the red phone days or what ever that app was called before signal.