I have used them a few times for both my DD (03' mitsu lancer) and my nova.
I bought the little bottle thats much like a bottle of nail polish and it was good for small rock chips. But the stuff i really liked was the spray cans!
I painted my front filler panel with one of the spray cans and it came out awesome! The only thing is if i remember correctly the shipping was kind of slow (couple weeks) but other than that i was very happy with the products.