different folks have different opionions on the subject.
personally i beleive my phone is totally crippled without the jailbreak.
if all i wanted was basic smartphone functionallity,i would have stuck with my long time love of nokias superior build quality.
but,allas,i have jumped ship to apple,jailbroke the phone before i ever even walked out of bestbuy,and never looked back.
the look on the guys face when he asked what i was doing was pricless"jailbreaking,DUH!"
as long as you back up your phone before any jailbreaking,you should be fine if anything messes up.which is rare,ajilbreaking is pretty safe now
when i had to restore mine,the restore worked perfectly,right down to all my game saves and checkpoints.(i was so worried i would havre to start infinity blade again)
and the mods,themes and tweaks really help my phone feel like my own, not apples phone that i am paying to borrow till i break it.
yes,everyone has one. but not like mine...its mine mine mine damn it!