Make my water heater electric has anyone used these kits?

Used one on a class A. Set it up to run off the inverter. It was nice arriving at the campground with hot water ready to go after a day of driving. When we lived in the RV for a year it was also very helpful, if my wife and I both took showers back to back, we would just kick the LP on as well, otherwise it allowed us to sit for months with moving to fill the propane tank.