I bought these coils at the end of April and will soon mount them on my Ford Edge. 3 days ago the 4th cylinder went out. I bought a new one from my local parts store today and it cost me the same as these 6 but well worth it if it really lasts. So I think it's only a matter of time before I start replacing others. Moral of the story: you get what you pay for. Don't worry about that. I never write reviews (too lazy), but I took the trouble to write this one, so take my advice. Many Thanks