Just wanted to mention that I made the jump from Icon to the 1520 on AT&T and I could not be more pleased. I live in Jupiter and work in Palm Beach Gardens (South Florida) and I was afraid I might lose out on coverage, but AT&T's coverage here has been as good if not better than my Verizon coverage. In fact, when I was switching at the AT&T store, I was explaining to the associate helping me why I was switching, and he told me that he used to work for Verizon. He said make no mistake - Verizon has a great network - but he also said here in South Florida AT&T has every bit as good of coverage as VZW. Your mileage may vary - but I have had nothing but good coverage so far.
Besides that, I get to use the built in voicemail app, which is way better than the crappy Verizon one that only notified me when it felt like it and that I had to pay extra to even use.