I must be the luckiest guy in the world (haven't won the lottery yet though), 17 years traveling all over US (including Alaska) and Canada (135000 plus miles), total of at least 550 different hookups / campgrounds and haven't fried or ruined anything yet. I do have a "Good Governor" monitor plugged into a visible outlet that I check after plugging in and before I fire anything up and then keep an eye on during our stay and that has been my guide for all those years. Not saying that a Progressive Unit is a bad thing just having a little trouble believing it is as critical an item as some seem to profess.