I've been using iOS 6 Beta since day one but as much as I love the new maps and the fact that you get free turn by turn integration I'd recommend you still keep your stand alone TomTom app or what ever else you use. Until there is perfect 3G coverage you could run into problems using maps. For example to test maps I decided to run my wife into work which is 28 miles away from home and out in the country side. After dropping her off I goto set maps to take me home but I had No Service nevermind 3G this doesn't allow maps to work as it can't pull in data so it was of no use to me. The stand alone can be several gb in size but that's because they have the maps preinstalled so it doesn't matter if you lack 3G. I'm sure you are all aware of this but there maybe some people out there thinking this is a perfect replacement for their Sat Nav apps.