iPhone convert... maybe
I am a long time iPhone user sickened by Apple's lust to control every facet of the user experience, so have purchased a GS3. So far, I've mixed feelings; I love the level of control available, but sometimes dislike how complex it is to perform relatively easy tasks, such as turn off just the audible email notification (using K-9 mail) full time - a task I am still seeking a resolution to. Also disapointed by battery life, though i do like that I have the ability to swap out batteries.
As I said, the jury is still out. No regrets about ditching the iPhone, just not sure the GS3 is a long term alternative.