"huge improvement from 4 but...."4.0 starson by volsfan0911
Pros: LTE, much faster processor, display looks even better, Apple ecosystem and integration
Cons: no NFC, no voice/data simultaneously on VZW, comparatively small display, Maps
Summary: I'll probably sound like many other reviews. Coming from iPhone 4 on VZW so the speed factor is HUGE. Speeds are amazing and the phone itself is so much quicker and more fluid in operation. As an upgrade it's a no brainer in that regard. I will take the apple/Mac integration in this case over the extra features you give up from Android. With iOS, you know apps will work, iCloud will transfer contacts/calendar/etc. to the rest of your iOS/Mac environment and that's huge for me since I work on a Mac and also still have an original gen iPad. But this is not the next Jesus phone by a long shot and certainly has its faults. Really comes down to Android versus iOS and your valuation of features. If the big screen and/or Android world is your thing this that's your choice - GS3 in a heartbeat and I'd be happpy. If you're in the Apple ecosystem as I am, then I love my new phone.