Hey, I'm trying to jailbreak my iPhone 3GS with iOS4 on it. I'd like to know from people who are experienced with jailbreaking how risky is it? What are the chances of my phone becoming a brick, or the battery life being ruined? Also are all the normal iOS4 features still intact? Basically I need a full list of advantages and disadvantages. My main reason to do this is I want to buy an iPad with WiFi and enable tethering.