If you plan on driving in Europe, consider getting the XL IQ Routes with European maps
TomTom XL IQ Routes Edition Satellite Navigation Unit UK & ROI
List Price: £159.99
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The same great features and functionality of the TomTom One IQ Routes but with a 4.3" XL screen.
For some people, the standard 3.5" screen size of most sat nav's is a bit too small. Not only does the bigger display make it easier to see and follow the instructions, but also making selections via the touchscreen.
Now, it may seem like the 0.7" difference between the TomTom One IQ and the TomTom One XL IQ isn't that huge. However, in practice, it does make things a lot easier. Think of the numbers this way: it's a whole 20% bigger screen.
All the other features and functionality are the same as the TomTom One IQ Routes standard edition.
The downside of the One XL is the price. It's going to cost around another £40 just for the bigger screen.
Summary: If you don't need the larger screen go with the regular TomTom One IQ Routes.