Chas, I do not like them, will never have or use them, no confidence or trust in them. Technology may be a fine thing, but not at my expense when it comes to a car & the tyres, Eg, a person kerbs their car, they can replace with a proper spare, I admit that's not a puncture but that's not the point, what happens if you hit debris late at night & the tyre will not inflate? this magic tin will not repair the tyre in them circumstances, we all have our views, but going back to what myself would do if I bought new & there was none or one of these mickey bloody mouse tyres in the boot, they can either supply me with a proper wheel for the car or go elsewhere that does. Simple.