I upgraded, and love it. I do with the viewfinder was larger, however it is still quite good. Even when wearing my glasses I can see the full frame. I turned off the touch screen, because I'm a left eye shooter... nose... screen... no good. I still had enough customizable buttons for all the features I use most. The ISO doesn't bother me because I used a button for that.
Auto focus speed is up, and photo quality is pretty amazing with the newish sensor. I couldn't go back. I love the small size and shape. It's a beautiful camera, yet doesn't attract huge attention (and as an introvert that is a great asset).
Are the SLR Styled camera's more flexible? probably. Do I need that flexibility? No. The real question for you is, what do you use. What do you need?