so i have a 3G and im planning to upgrade to 4.0.1 OS, should i do it or not? any of you guys can chime in and help me? a buddy of mine updated to the OS4 and his phone seems more sluggish now that he's running OS4. he has a 3g as well. any of you guys having a 3G that upgraded to 4.0.1 may tell me the pros and cons?