The XL adds a larger display to the already fantastic ONE unit. The new EasyPort mount and TomTom’s Map Share feature make this an enticing unit.

If you currently own a GO 720, then there is no real reason to upgrade, as most of the improvements are software upgrades. If you are looking for a high-end GPS with all of the latest features though, the GO 930 is excellent, if a little overpriced.

The latest edition ONE features an even smaller design and an EasyPort mount, and supports TomTom’s Map Share feature. The ONE continues to set the standard for other GPS units to strive for.

The RIDER 2nd edition offers several significant improvements over its pioneering predecessor, including a superior headset and bike mount. While a few flaws remain, it has managed to avoid most of the key obstacles that hamper other units.

With an excellent map display, easy-to-use interface and clear audio instructions, the TomTom GO 300 has nearly all the features drivers need in a GPS system.

This is by far and away the best GPS unit on the market. It combines an excellent design with a fantastically easy to use menu system and features a whole range of extra offerings such as Bluetooth hands free, MP3 player and excellent text-to-speech technology. A must have.

The ONE has received a facelift and although the improvements are largely focused around the aesthetics, this is still one of the best value for money GPS units on the market.

TomTom’s latest addition to the navigation market continues the company’s fine form when it comes to the user experience. The GO 730 adds some excellent software features to a package that we’ve come to know and love.

At this price, and with this feature set, the TomTom ONE blows away the competition.

While Tom Tom does get credit for trying with the Rider, there are some key flaws with this GPS solution that have to be overcome.

The GO 720 is another fine unit from TomTom. It features a slim design, great maps and navigational performance, Bluetooth for handsfree calling and some great safety features.

The ONE 3rd Edition adds an excellent safety feature to an already outstanding unit, though it's a shame battery life hasn't been improved. Regardless, it's definitely great value at this price.