The application is easy and "dirty" is not always equal to the rims, tires are black. So far so good.
The durability and the "Black" effect, however, could be a bit better, the price is in the upper end over the competition. Therefore, a star deduction.
A good alternative product I can recommend here Meguiars Tyre shine, though the application is something bad because it is a gel and no spray. The "black" effect and the durability sid but better here and partly to get it even cheaper than the A1.
Meguiars Endurance High Gloss Reifenglanzgel, 473ml
For easy, fast refresh but I use it in between. But base remains Meguiars.