Extended warranty. What are your thoughts

I bought an extended warranty on an 01 Duramax 3500 DRW. Cost me 1800. Right before I traded it at 100K, the ECM went out and cost $1800 to fix which the warranty picked up. Being a first year engine and tranny, I felt it was worth the cost. As it turned out I barely came out, I have never bought another warranty. I cant think of a time that I needed it, my 5500 could have used it but it never would have covered the issue I had since it was so far over OEM warranty.