I'm a recent convert from Crackberry as well. I posted this story elsewhere, but a quick re-hash: Blackberry user for the past few years, first with a Tour, then with a Torch 9850. Really liked the Torch at first, but it was getting tiresome the past few weeks. It was running slow and I had to do frequent battery pulls.
Switched to the Galaxy S III this past Friday, and not looking back. It blows away anything Blackberry currently offers by a wide margin. I wasn't going to wait around for RIM to maybe get new BB10 phones out in first quarter of '13. I expect those devices will feel half finished or already dated by the time they actually get out.
I'm tired of reading about RIM's new cool stuff "coming soon" or "just around the corner." I bought a Playbook on launch day, and it took them forever to get it functioning how it should (software version 2.0 took over about a year from launch day to come out). The core concept of Blackberry is still good, but RIM's execution the past couple years has been infuriating. I'll probably be selling my Playbook soon, as my Galaxy minimizes my need to have a separate tablet.