Do not buy a Garmin product.  The features are awesome; however, it does not locate positions as well as the Tom Tom.  And, the life of the unit is very, very, very short.  The ability to connect to the satellite is horrible.  Do your research on all of the trouble shooting blogs before you purchase.  I have a NUVI 660 and I am putting it in the trash.  It stopped working after less than two years.  HUMHHHH!!  Do not buy this brand!!!!!!!!!You were warned.

nuvi 660 comes ready to go right out of the box with preloaded City Navigator® NT street maps, including a hefty points of interest (POIs) database with hotels, restaurants, fuel, ATMs and more. Simply touch the sunlight-readable color screen to enter a destination, and nüvi takes you there with 2D or 3D maps and turn-by-turn voice directions. It even announces the name of exits and streets so you never have to take your eyes off the road. In addition, (http://www.highspeedsat.com/nuvi660.htm) nüvi 660 accepts custom points of interest, such as school zones and safety cameras and lets you set proximity alerts to warn you of upcoming POIs. The European version even includes a preloaded safety camera database containing the location of safety cameras for parts of Europe

The Bluetooth function allows you to pair the nüvi 660 with your mobile phone and effectly provides a voice operated hands free kit. I had no problem pairing the device with my Sony Ericsson K800i phone. Once paired I had access to my phone book, call lists and voice dialing.
Voice dialing. I agree with all apart from the Voice dialling struggling here to get mine to work
Barry

I just bought this sat nav, after owning a Tom Tom One. This is such a fantastic bit of kit!
The only thing i will say is make sure in the settings you change the voice, as the one selected as standard is really annoying! I would personally recommend "British Dan"...!

The only real critisism if i am honest, even though the map is good, i do find that its not really clear through the map when on the motorway and their are to exit junctions really close together the map really doesnt point out clearly enough which one you need, you really have to rely on the voice and the text instructions - which can be annoying when you need to concentrate on the road...but this is only a really small critisism. I would give it 9.8/10 !!!