I have mine showing. Always turn that on first thing whenever setting up a phone. I wish there was a way to clear out the status bar, like not having the little clock showing all the time, or not having the rotation lock showing all the time. Also, still don't understand the need for 2 spinning wheels when dates loading.
I have mine turned off with all my other devices i usually have it to show but on the iphone it is depressing to watch it drain so quickly all day so over past few weeks ive had it turned off. much more happier now.
I shut mine off a couple of months ago, and have been going without the % showing since. There was a short withdrawl period, and I always looked to have a charger handy. I even blew the dust off my Mophie Juice Pack case. Now, I don't start to mind the battery until it turns red.
I have a blackberry and I use meterberry. I find when the percentage is showing I worry more about the battery. Every 1% it drops I scrutinize. I'm a battery nut so I have a few spare ones for my blackberry and even a seidio extended one for long days. I'd prefer to look at the meter than the number because it's 1 less thing I worry about in the day.