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This was the latest in the Tom Tom Go range when I bought it- the then top of the range 930T.
Initial impressions were good, the unit is compact, with a large 4.3" screen (can be a bit difficult with reflections in bright sunshine) and black plastic and looks very attractive. Set-up and installation was easy too, but the maps required updating as the shipped ones were out of date. These maps were downloaded, both Europe and N America were 2GB each so watch your download limits, or download off-peak- my connection took 30-40mins for each one!
The device is very easy to use. It comes with a remote control (pointless if you ask me), traffic FM receiver and a car holder/charger with USB cradle and disc for set-up.
The menus are good and it allows searching by postcodes and other options. Indeed there are a huge range of downloadable Points of Interest, I downloaded Shell Stations for example.
Navigation wise it comes with IQ routes and a traffic receiver. IQ routes promises to find you the fastest route by time of day and my nav varies routes depending on time of day, knowing some shortcuts. The FM receiver sometimes struggles to get a signal, but does give useful traffic information- sometimes however the data provider gets it wrong.
Navigation is good- clear maps, lane assist and clear speech warnings. By far the best feature is the mobile phone hands free unit- this allows you to talk hands free, and keep legal- one reason it comes if I know the way. The maps were fairly accurate, however for another £40 you can get 4 new maps a year, and you can make corrections to the maps using map-share which communicates them through Tom Toms PC connection to keep things up to date.
The biggest let down is battery life- awful in the unit- 2hrs max in my experience, however in car with a cigarette lighter / 12v no problems.