This phone looks great and I can deal with no SD slot, but its lack of removable battery is a tough one to swallow for me. I'm used to being able to carry an extra fully charged battery around with me and just pop it in when the current battery gets low on charge. I also wish they would have increased the screen size slightly. My S3 at 4.8" no longer feels large; it feels almost too small at times. This phone is .1" smaller diagonally. Many people don't want a bigger screen, but I'd like a 5 - 5.375" screen (The Note 2 takes it a bit too far IMO).
That said, I would prefer the premium build over Samsung's plastic any day. I have a feeling the S4 will likely be my next phone dues to its larger screen, (hopefully) removable battery, and my comfort level with Samsung's products.