I've had several of these devices and have installed them for clients as well. They are not industrial grade, but for the price they are quite good. I've found that a timer is often just as useful as a temperature gauge. They work best when it's snowing to melt the snow in the gutters (they also need heat tape), not after. Sometimes when a very strong fast storm hits them, they don't completely melt the roof because the snow "overlaps" them and they form an 8 inch tunnel around the cables. For reference, they use 5 watts per foot, so they affect your electric bill. I use them sometimes when the sun hits the roof since Colorado nights are usually well below freezing and these cables don't work below 10f.
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