I recently upgraded my iPhone 3G to the Gold Master of iOS 4.0. It seems to run really slowly on my device and, as advertised, not all the features work on the 3G. I've seen several methods online to downgrade my OS, but I'm wondering what the state of my phone will be after I downgrade. Im debating if I will upgrade to the public release of 4.0 on the 21st, even though I'd just have to deal with it for about 4 days until my iPhone 4 arrives.