A client of mine uses them on ever hose fitting around his house. I've tried them twice, and had them break on me twice. He's gone through over 6 sets this year. As with 99% of china "warranties" it costs as much as the hose in shipping, and they actually make some money too.
We found as long as you don't stop the flow of water in the hose, it'll last a couple of months at least. The thin water balloon insides just expand and pop with garden hose pressure. I could write a whole book about how horrible these things are, including the "brass ended pro version."