I haven't tried to upgrade my iPhone 3Gs in iOS5 not only because it is a beta, but maybe it will slow down the performance. I'm wondering if users who upgrade their iPhone 3Gs to iOS 5 has experienced any differences in performance... The reason why I asked this question because of what had happened in the previous update which is iOS 4. The 2nd Generation devices (iPhone, iPod Touch) became slower. So what I think was that the 3rd Gen devices would be experiencing the slow-feeling in iOS 5. Anyway, I really hope there's an answer to my question.. My iDevices: iPhone 3Gs, iPod touch 2G and 4G, iPad 2 16gb.