Let's see....I don't like the bubbles, so I turned those off. When I have a text dialog open, instead of seeing the contact icon, I would only see the persons name now.
When I got a new text message, I would get a notification in the bar and the text message would pop up on my screen. If I clicked on the message on the screen, the notification still stayed in the bar, so I still had to grab that and drag it down to get rid of the notification.
I could go on.
I'm not bashing the app, I am sure it's cool overall.
-Mike