I hope I never have to use it! However, a few years ago I had my water supply cut off for 5 days and my supplier (Anglian Water) were absolutely useless and just denied responsibility and provided zero support. I'm not giving it 5* because it doesn't have a scavenging hose and you have to fill the bottle manually. That means a 5 mile cycle or hike for me to the nearest river. However I've also bought the Liberty, which does have a scavenging hose, so I hope I've covered both bases : long life and versatility.