We are all aware of how unusable the 3G becomes when upgrading to iOS 4. However, when jailbreaking, it becomes even worse! I don't feel safe jailbreaking my iPhone 4, so I jailbroke my old iPhone 3G. 1 word: HORRIBLE. Cydia takes like 5 minutes to load, and that's before I get the first error message and have to restart Cydia again.