Who does not want his car-navigation system run through the area, city or mountains, then this device is highly recommended. Very good to handle, the maps of the unit are very accurate and detailed. Sure there are better units, but also considerably more expensive. On display I can tell if I'm running from the street to the left or right, who is more accuracy I do not need that. The included bike mount is very good and safe bolted to the handlebars, the Teast one is then fixed with a screw in the bracket. The maps of the unit you can look on the internet in advance if you come with it rightly. So I'm from Teasi one excited.