My parents bought one a few years ago (Guardian by Generac) after we had a major ice storm in OH and many locally were without power for a couple weeks. I thought, that will never happen again, dont spend the money. Well, a year or 2 ago we had that nasty windstorm from the hurricane and my power was off for a week +, so i spent alot of time listening to my parents guardian! They have an older model and they are LOUD!!! but it kicks on automatically and runs and runs. During that long outtage i did go over and help dad change the oil and look over everything. but it kept up without a hiccup. Theres kicks on once a week and runs for 30 mins. I tell you what, its nice...but $$$. They are selling some remfg ones around here now that are priced better, but i guess the new guardians are a lot quieter. I asked dad about the nat gas it burns he says he doesnt care, its better than not having hot water! As long as i can make it to there house to shower im not getting one...i have a portable gen i can recharge my freezer every 24, and im fine with that.