Little underwhelming coming from a iPhone 4. Speed difference is negligible so far. LTE is more annoying than its worth in my area as it constantly drops to 3G/"4G" causing my web browsing to pause and stutter as it switches. The 4G is worse than my iPhone 4's 3G. Granted I've only been using it for a few hours. Maybe I got caught up in the hype and my expectations were too high. Nonetheless my 4 was starting to die so the upgrade was needed anyways.