The color multiplied icons are still not my cup of tea. But they seem to do a better job of applying colors and blacks to the appropriate foreground and background elements.
Still feels differently ugly than what Android does. On one hand, they all match. On the other hand, they are ugly color multiply, not a color fill. Which looks muddier.
Currently on DB2 and no issues to report. iMessage seems snappier and less jittery.
Can report that RCS is working on AT&T. That being said, I received my first RCS message while not being connected to the AT&T network and without WiFi calling being enabled on my phone. Was at home with my phone on WiFi only and received a message from a friend who has an Android phone. I replied with a heart, text and some pictures. The second message failed (its beta) so I turned on the cellular service to complete the conversation.