I'm very glad I spent more on this than manure waste. I had a pretty big puncture in a new tire. I fixed it as usual. First I used Chinese cheaper green and black materials along with their gum slime. In short, it flowed, flowed, and flowed. I stumbled across this product while looking for a new tire so thought I would buy it and see if there is a difference, also I needed a kit for another car anyway so what the heck. In short, the thing works! I pulled out the old plug and cemented it, then replaced it with a safety plug (no cement required). It's been months and thousands of miles and it's holding the air like new. I have NO leaks and have not had to buy a new tire. It's proven, durable and made in the USA. Stop thinking and buy it already Pros: - Durable - Made in the USA - High quality materials - More reliable than the competition Cons: - Price