I too am very welcome to change from Apple, and I loved the new iOS 7 design when it was announced. However, the one thing I didn't like was the decreased stability and performance of iOS 7 compared to iOS 6. I'm excited for future releases because I hope they will bring back stability and performance.
oh yes, i totally left that out, thank you for noting that, the performance did suffer, especially on LTE, i used to get phenomenal battery life with iOS and on LTE, i would get 18-19 hours off the charger, at least on LTE when on iOS 6 and now on iOS 7 with my 5S, i couldn't get close to that, maybe 10 hours off the charger and safari just has always seemed slow for me, but other then that, ive love iOS 7, can't wait until the unveil today!