I bought this app back in October 2009. Priced at about £80 / 1.4GB download file.
This has to be the most useful of all my iPhone apps so far. It has all the normal TomTom functionality that you would need to complete any journey no matter how simple or complex. The Navigate option uses Favourite locations, Contacts, Post Code search. The app has an Alternative Route feature including Roadblock avoidance and Travel via options. There is a Day/Night Colours setting and the Mute sound option. The Points of Interest are particularly useful in European cities where you wouldn’t know where to park or shop etc. POI can also be found Nearby, in a City and Along Route.
The app works well in both portrait and landscape orientations and the buttons are easy to push while driving. I think the iPhone is excellent for apps like this, where other devices are absorbed and get better.
PROS: Integrates well into the iPhone device, fully loaded with the normal great TomTom features.
CONS: App size is very big and takes an age to download.
I have recently bought the US and Canada too at £50 GBP. Considering that the car rental company wanted $20 a day to rent one, it was a no-brainer to simply buy it.