I have read a lot of site, and realized that I had rather live GPS for big or very big road, someone who just goes out from time to time for the holidays or friends, has not need a live GPS, a good GPS with all the features you need is enough.
This is why I opted for this great GPS (5 inches), size provides a real visual comfort, no need to move much head to look, the signs are very clear as far as visual sound.
Also I recommend to check out the tomtomax community for radars etc ... (Free)
And the cover of Navitech in order to cram the GPS is inside the accessory :)
Nothing to say, both on delivery than on the product, again, I recommend Amazon-on.