I have Sprint as my portable internet connection. Need input how it is working in the Chicago area.

I don't personally have Sprint, but a friend of mine has an iPhone 5 with Sprint, and he says the data/voice is solid in the city. He lives north of the city and his internet can be a bit hit or miss there. He doesn't always get the full high speed internet, but when he does it's really fast. My phone has AT&T and I think it's a bit more consistent, but it depends on where you're at.