Not sure what I think yet. have a store bought one on my DHW system and its been flawless for 19 years. This one has some added costs, you have to have a 12 volt cube power supply. No big deal for me as I had one. He reccomends using another relay if you are using 120 volt pump, again I think I have one in some piece of equipment I have laying around. You also have to get it in some kind of box, again I have that no problem so its no biggee for me but for others those expenses would add up.