Angry at sprint for no 4G in Chicago yet.
It depends on what part of Chicago. Most of the northern suburbs seem to have it. Where I am, in Glen Ellyn, it keeps turning on for 10 minutes, then back to 3g. I keep hoping today's the day they leave it on. I have run speed tests when it's on, and it seems like it's always 4-5mbit up, and 9 mbit down.
I think the phone is great btw, lightning fast.