I paid over £400 for my Garmin 670 and after having it a year
I am very disappointed with it.
My main area of critism is that I live near a motoway in in Kent
(M20) which I want to avoid on most of my journeys but when I select avoid Highways ( no selection for Motorway) on my Garmin - it stupidly selects journeys on B roads or unmarked roads. All the back lanes in Kent instead of A roads. Selecting faster times etc. has no effect..
Even my Archos attachment GPS deflects to A roads.
As does most very cheap Sat Navs I have tried.

The Garmin nuvi 670 is a superb piece of kit, fast accurate and reliable. Voices are clear, information is clear and the display is fantastic. So far ahead of TOMTOM because they really are the leaders in this field and not just commercial gimmicks.

I'm not happy with this product from Garmin. Fortunately I did not have the pleasure of keeping it too long as I bought a keiro FS900 after a friend recommended it to me.

I cannot believe what I went through with this sat nav. It was absolutely rubbish and wasted weeks of my time. Never buying a Garmin again. I read a review about a Keiro FS900 on here and managed to track down the eBay seller in the UK. Bought the Keiro and it was like a dream come true. What ever they say on here about this little beauty is not enough.... I never heard about this thing but since its Japanese I thought I give it try. So I have to agree, don't waste time and money on any other sat nav, if you want something that's going to work properly and give you all the features you need its Keiro FS900.

Made the mistake of buying a big brand product! This Garmin, although pretty good, it is no where near as good as the Keiro FS900 or Keiro RS850. I do a lot of driving and I currently have 6, yes 6! sat navs. because each one from tomtom GO930 to Garmin 670, Sony, Becker have been a disappointment when you drive around UK and Europe as much as I do. At a price of 340 pounds it was a big rip off when you can get the Keiro FS900 or RS850 for around 200 to 230 pounds and it has the full map of europe plus a fantastic speedcam alert for the entire Europe. This was my first Garmin, after trying almost every Tomtom (which is suppose to be the best brand!). I thought I give them the benefit of the doubt! Costly mistake!

After a lot of thought I decided it was time to enter in to the world of Sat Navs and I purchased the Garmin nuvi 670. I do enjoy traveling and as sad as I am I enjoy getting lost, but sometimes you just need to get there quick and that's when my Garmin comes out.

I recently used it on our annual road trip to "T In The Park" which is a long journey from Manchester up to Balado in Scotland. It was easy to program in the destination and it even saves it for future reference which I liked. The maps them self are very easy to read you can have either 2d, 3d or night mode (which it will set it self to at dusk). The instructions are clear and the voice is pleasant enough. The problem I had with the direction was in complicated lanes choices on the motorway but a quick glance at the screen made it all clear.

As for accuracy I am not to sure as the route it brought me up to Scotland was not the route it brought us back in. I know it has a lot to do with the direction your car is in but surely it should choose the most direct route which should be the same? Nevertheless the route we came back was a much prettier way and enjoyed the country roads.
The traffic receiver was also good, however driving mostly on motorway it does not give you the choice to redirect. As for the design you will laugh, I had trouble with getting the sat nav of and on the window bracket. That was until my 7 year old showed me how to do it after seconds in his hands.

The Garmin also comes with extra features that people come to expect of their sat navs, like the speed you are traveling at (which is always a few miles per hour under what my speedo says), Bluetooth, point of interest.

Overall I am very pleased with my Garmin and recommend to all. It is not the cheapest but it is reliable and easy to use.