The big issue is that the battery life is no good, i cannot get 5 hours out of my iPhone 5, make it hard when you are on the road all day.
the other issue is that the reception is not as good as the 4s.
in short if you have the 4s do not upgrade
I disagree whole heartedly with this post.
My battery life has been perfect, especially considering the battery pig that is LTE...my reception is a WORLD better than any other iPhone i have ever used (i do not get dropped calls anymore ANYWHERE in the Atlanta area...this was not true with any of the other iPhones).
I'm on the road for about 85% of my working day...3 days a week for 14 hours, and 1 day a week for 6 hours. And while i do have the luxury of being able to charge my iPhone whenever i want really, I've let it sit running hot spot tethering and music through my radio without charging and the battery life has been superb (all things considered).
In short, if you want an iPhone 5, don't listen to this guy's opinion. And to the OP, you're pretty new to the site to be trying to force feed advice.