This is an excellent piece of kit.
I didn't get mine from any seller on amazon but thought it worthy to review it anyway.
Have been using mine now for several weeks in my job, have been driving trucks from 40ton artic's to 7.5ton wagons, even used it as a normal car satnav as well.
The biggest thing that will trip people up, and maybe the other reviewer is to make sure you fully input all the dimensions of your truck at the start of the planning stage.
Height, weight, width and maximum speed, including any hazmat stuff etc, when you do this correctly and tell it where you are going it automatically sorts out where you cannot go and warns you.
If like me you are nosey to see what happens if... i left it on 23ton truck, 8ft wide, 33ft long and put it in my car and went onto a weight restricted bridge road, it warned me instantly, even showed it as a no go road on the route.
Add to this the live traffic, and it is well good, has saved me time on a few occasions now when traffic has become crap on my journey, it warns you and offers an alternative route you can take of decline.
Not sure if it knows the London green routes, that rule of no lorries before 7am thing, as iv'e not been there with it yet.
The lifetime maps will save a few quid overall as well.
One tip i would suggest, make sure you get a screen protector and a good case to keep it safe and protected.
I would deffo buy another and totally recommend it.