I was a smart phone holdout until my company approved iphones for product engineers a little over a year ago. I got the iphone4 (only one available then) and I've loved the damn thing ever since! A few months after I got it, I changed jobs and now travel a LOT and honestly, life is soooo much easier with a smart phone. I use it for EVERYTHING when I'm on the road (even use the kindle app for reading and leave my kindle at home!). In fact, I've used the browser and another app to do work from it when the hotel wifi was so bad that my laptop was useless. You know it's a bad connection when 3G is faster than wifi! My only complaint is that my calendar does not sync well AT ALL (we use an exchange server). It's ok for the initial sync, but if meetings move or change, the phone rarely gets it right and it's been a real problem for me. So much so, that I'm actually considering a windows phone when the time comes.

Like Oak, I found that things got quicker with the iOS6 download. I don't use google maps (I hate them, actually!) so I didn't hesitate when prompted. I use a mapquest app (free) that works like a charm and has voice navigation which is important to me when I'm driving alone in rental cars and can't be watching the phone all the time. I don't have any battery life complaints, but I'm rarely away from a place to charge it for very long unless I'm on a plane (and battery lasts longer in 'airplane' mode anyway).