I normally avoid extended warranties, especially for electronics. We're normally very careful with our electronics, and by the time they break, it's usually time to upgrade to new technology anyway.
I have made only two exceptions. First, when my son went to college, we bought Microsoft complete for his laptop. He's reasonably careful, but it seemed like there's too many opportunities for a college freshman to break his laptop. That worked out well. The laptop did indeed break. Since that model laptop was no longer being manufactured, they gave us the full purchase price credit toward any other device in the store. We used that credit to by an SP3. Sweet! MS really stands behind the complete service.
The other exception was that I bought MS complete for the Bands I bought for my wife and I. Like the college freshman's laptop, there are just too many different ways these things could accidentally get destroyed.
I haven't bought the coverage for other stuff I've purchased through the Microsoft Store. But then again, I don't play tennis or lift weights with my laptop or Xbox One.