I decided to update to 4.1 on my iphone 4 seeing that if io had any problems i could just downgrade using my SHSH (spelling). And one of the first things that i noticed was the imporved battery life. On 4.0 i was jailbroken and battery life was still very good but nt nearly as good as on 4.1. I only had a very small amont of tweaks installed such as SB settings. I believe winterboard was the culprit. I love winterboard it justdoesnt seem to be optimzed for 4.X... Just my opinion anyone agree disagree?