I don't mind the look of the current messages and would be pretty indifferent if they changed it to the way the messages look in iOS 7
I use messages on both my computers and my phone and while it doesn't work perfect.......messages out of order, disappearing, if computer was in sleep they load funny if at all.......I still find it very convenient for myself and love it.
The only issue I wish they could fix is sometimes people get 2 chat conversations with me, 1 from my phone and 1 from my email. Its not for everyone though, just certain people it does that to. I've tried to fiddle with my settings and make sure the other person has my email and phone # in 1 contact, etc, etc but it still does this from time to time. I wish they'd fix that and I could easily live with the rest.
This! I have group messaging off on my devices, yet twice in the past year or two a message was sent by me and received twice. Additionally, some were sent as group, one of my friends is Victor Garber, and he didn't appreciate others knowing his phone number. It was incredibly embarrassing